Metra 82-358C Speaker Mounting Brackets

Install 3-1/2" speakers in select factory 4"x6" speaker openings

Item #: 12082358

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5 Reviews

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Metra's 82-358C brackets will allow you to install select 3-1/2" speakers into the 4"x6" factory speaker openings of many vehicles. Please enter your vehicle information or call an Advisor at 1-888-955-6000 to confirm that these adapters are compatible with your vehicle. Warranty: 60 days.

Metra 82-358C Speaker Mounting Brackets Reviews

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Metra speaker adapter

Written By Mike C., Lake Zurich on Wednesday, October 21, 2015

Crutchfield Customer Review (What's this?)

These are a fantastic product in order to adapt round speakers into a automotive factory mount for normally sized 4x6 speakers.

Pros: Universal. All auto manufacturers use different adapters, and hole alignments. These fit the need perfectly

Cons: None, easy and versatile.

Great devices

Written By Agen, Middletown Del on Friday, October 16, 2015

Crutchfield Customer Review (What's this?)

Great item had to drill to fit my speakers and vehicle but awesome all the same.

Pros: Durable plastic and handled the drilling for new holes easily

Cons: Could have holes pre drilled

They do what they are supposed to

Written By Josh S, NH on Friday, May 08, 2015

Crutchfield Customer Review (What's this?)

I ordered these on accident, needed 4" adapter but these were right above them in the product list and I didn't pay attention to the description. They are straight forward to use and will work if you have 3.5" speakers to fit in a 4x6 opening. If you're a dope like me and you have 4" speakers, get the scoshe adapters. I have used these metra adapters before, on my last Sierra in the extended cab doors, and they do what they are designed to do and come with all hardware you may need. They don't come with instructions but honestly you shouldn't need them. Have a drill handy as you will most likely need to drill holes on the vehicle panel to mount these, then speaker screws right onto adapter.

Pros: Easy to install (may need to drill)

Cons: None

Worked great

Written By Anonymous, Kendallville, IN on Monday, May 20, 2013

Crutchfield Customer Review (What's this?)

Worked great and were free with my 3.5 speakers

Metra 82-358C Speaker Mounting Brackets

Written By Anonymous, surprise, az on Wednesday, March 06, 2013

Crutchfield Customer Review (What's this?)

they fit.. i was hoping i would be able to fit my speakers in while having my stock speaker grills flush mounted. this didnt happen...i mounted the 3 1/2 INCHES speakers below the brackets to fit

Hands-on research

What's in the box?

Download owner's manual

  • Two speaker adapter brackets
  • Twelve 1/2" Screws
  • 12 Speed clips
  • Instructions

Product Research


Overview: This bracket is designed to allow replacement of factory speakers in certain GM vehicles with select aftermarket 3-1/2" speakers. (Please refer to the Crutchfield Vehicle Selector to confirm fit in your vehicle.)


  • Cutout Diameter: 3.17"
  • Height: 0.125"
  • Diagonal Hole Spacing: 3.87"

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