Summary: Its says that it will fit an 88 s10 but the speakers is too deep to fin in the plastic housingin the truck. There is a fix: take the stock nuts and flip them over then use your thumb to tighten them. You can use some needle nose to tighten them more if you want.
Pros: Good quality and good sound
Cons: A little damp in sound magnitude.
Not a good fit in the truck housing.
Summary: Speakers installed perfectly as described in my '87 Fiero. Much better sound quality than the factory speakers. I appreciated having the speaker wire harness included in my purchase at no additional charge.