1990 GMC sierra speaker sizes
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As far as I can tell my truck has no door speakers so only dash speakers and rear speakers. O its a single cab so it has the ones that are right behind your head.
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I agree with Cams 98 Silverado; Crutchfield.com has an excellent database of speaker sizes for vehicles. As for door speakers, mine has 6.75" rounds, which may or may not be different from yours. I'm too lazy to do your vehicle lookup on Crutchfield. The tower speakers are 4x6s.
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There were several different interiors throughout the generation 88-98, so I guess it would just depend on which one you have. I think one of the largest changes interior-wise occurred between 1994 and 1995.