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Alpine KTX-GM8S-O Perfect FIT Dash and Wiring Kit

Install and connect an Alpine GPS receiver in select 2007-up General Motors vehicles — retains OnStar® and steering wheel controls (Silver)

Item #: 500GM8SO

1 Review

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Original Price: $499.99

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Keep your factory look and controls

This Perfect FIT kit lets you install an oversized Alpine receiver in your GM while keeping your factory look. The package contains a dash kit that's been specially designed to make the big Alpine 8" screen look right at home in your GM car or truck.

Alpine Perfect Fit

Plug it in and go

You'll need to hardwire your new Alpine to the car's parking brake. Then, the included wiring harness plugs directly from the Alpine receiver into your vehicle's factory wiring harness — no extra splicing or soldering needed. This Perfect Fit package works with both GM's regular and Bose® audio systems (but not the Bose® Centerpoint system), and it allows you to keep your OnStar functionality. The package also includes a steering wheel audio control interface — no programming necessary, just plug it in and go. Warranty: 1 year.

Note: This Perfect Fit kit will not work with factory Bluetooth® or the factory satellite radio tuner. It will also not work with the factory Bose Centerpoint system.

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so. You can also call an Advisor for more information.

Alpine KTX-GM8S-O Perfect FIT Dash and Wiring Kit Reviews

Average Customer Review:

1 Review

Alpine KTZ-GM8S-0 Perfect fit

Written by: Lonny from Clearwater FL on July 25, 2014

Crutchfield Customer Review (What's this?)

Fits good , looks better than alternative but the brushed aluminium doesn't match well. Buy the kit but get different harness and module so you're not stuck buying expensive replacement parts.

Pros: Fitment. Final look.

Cons: Doesn't match the brushed aluminum that great. Slightly difrant color and finish. And If the module goes bad you have to buy the whole kit , you cannot buy in pieces.

Hands-on research

What's in the box?

Download owner's manual

  • Radio housing
  • Radio replacement interface module (KCX-SRMGMO)
  • Antenna adapter
  • Wiring harness
  • 2 Mounting brackets
  • 2 Spacers
  • 4 Screws
  • Instructions

Product Research


Perfect F.I.T. Installation Packages: The Alpine in-dash navigation receivers with an 8" LCD touchscreen will not fit a standard Single-DIN or Double-DIN dash opening. To accommodate this large screen in your vehicle's dash, Alpine offers a line of Perfect Factory Integration Technology (F.I.T.) packages specifically for these receivers. Alpine's Perfect F.I.T. installation packages allow the Alpine navigation receiver with 8" LCD touchscreen to fit seamlessly into select vehicle dashes. Perfect F.I.T. is designed to cosmetically match the shape, color and texture of the vehicle's interior. 

Compatibility: The Alpine KTX-GM8W-O Perfect F.I.T. Installation Package allows seamless integration of the Alpine 8" LCD touchscreen navigation head unit in select 2007-up GM Trucks/SUVs with OnStar (with or without Bose). Not compatible with Premium Bose systems (Y91/Y92/Z75), Fleet trucks, or upper-dash OEM stereo locations. This Perfect F.I.T. Installation Package will not retain factory Bluetooth functionality or factory SiriusXM satellite radio tuners.

Make Model Year
Chevrolet Avalanche 2007-2012
Silverado 1500-3500 (LT models only)
GMC Sierra 1500-3500 (LT models only)
Yukon XL
Note: As always, please consult Crutchfield's Outfit My Car to verify fit with your vehicle.

OEM-Like Appearance: The KTX-GM8W-O Perfect F.I.T. Installation Package has been specifically fitted and engineered to fit select 2007-up GM Trucks/SUVs perfectly. It comes with a specially formed OEM-grade, high quality/high strength ABS plastic radio housing that is color matched to the dash. This allows the unit to precisely fit not only the vehicle, but also the Alpine 8" LCD touchscreen navigation receiver. In addition, extra care is taken to match the factory dash's shape, texture, and color ensuring a more OEM-like appearance. Unlike traditional universal dash kits, the Alpine Perfect F.I.T. packages include direct fit OEM-like brackets to ensure sturdy support and accurate positioning of the radio in your vehicle's dash.

Vehicle+Radio Harness: This Perfect F.I.T. Installation Package comes with a GM LAN Stereo Replacement Interface Module (KCX-SRMGMO) and vehicle+radio harness for simple installation between the Alpine 8" LCD touchscreen navigation receiver and your 2007-up GMC Truck/SUV. You get all the necessary harnesses and adapters in the box to install the Alpine 8" LCD touchscreen navigation receiver in your 2007-up GMC Truck/SUV.

Note: The vehicle+radio harness contains two Molex connectors which plug into your GMC Truck/SUV's factory radio harness. There is also an 8-pin connector which needs to plugged into either the vehicle+radio harness' Bose or Non-Bose port (based on your vehicle). On the other end of the harness is a 20-pin connector, 5-pin connector, and 3-pin connector which plug into the included OnStar/Steering wheel remote interface module. On that same end of the harness is a 16-pin Alpine radio connector which plugs into the radio connector port on the back of the Alpine 8" LCD touchscreenHD navigation receiver. In addition, you will need to make two hardwired connections between the supplied vehicle+radio harness and your vehicle's Parking brake (Yellow/blue) and Foot brake (Yellow/black). There is a remote turn-on lead (Blue/white) to connect an aftermarket amplifier.

OnStar Compatible: The included GM LAN Stereo Replacement Interface Module allows you to keep total functionality of your GM vehicle's OnStar system.

Steering Wheel Controls: The included GM LAN Stereo Replacement Interface Module also lets you keep your vehicle's steering wheel remote controls. For 2007-up GM vehicles with factory steering wheel audio controls, the KTX-GM8W-O retains the capability to control the Alpine 8" LCD touchscreen navigation receiver's volume, source, and playback controls. There is no additional programming required, simply plug & play.

Note: The 3.5mm connector of the steering wheel remote interface cable plugs into the 3.5mm remote input of the Alpine 8" LCD touchscreen navigation receiver.

Our Product Research Team

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