I bought these to replace the rear speakers in my 85 GMC K1500, and they didn't fit. My bad on that one, not docking any stars for that, but it's more of an FYI. The sound quality, however, left much to be desired. Quality wise, these aren't even as good as the $40 3.5" speakers I got for the dash. Looking at reviews for all 4x10 speakers, that seems to be a common complaint, so I guess it's just the form factor that makes everything very tinny and devoid of any "fullness." Even if these had fit perfectly, I would still return them. For a little bit more money, you can buy 6x9 enclosures for behind a truck bench seat and get some nice speakers for them. If these fit your vehicle and you don't want to use enclosures, these are definitely better than nothing, but I'd definitely give strong consideration to going another route.
Pros: + If your only other option is some 1980's era stock speakers, these are noticeably better
+ If you're not an idiot like me, these might be a straight bolt-up to your vehicle
Cons: - Not only devoid of low end sound, but it also makes the mids sound tinny somehow
- For being seemingly designed for retro vehicles, the mounting depth is such that I don't know what this would actually fit cleanly