Kysus

Still unsure of what size speakers there is behind the seat. If your'e trying to replace them anyways, might have to resize the speaker hole or just go with a box like in mine. My truck never had door speakers and am getting a pair of 90W Blaupunkt's installed

Don't have anything from the original sound system from 10 yrs ago except the ones in the dash, figured they havent blown out yet. Replaced the ones behind the seat with Pioneer 6x9's in a custom box with a 400W Kenwood amp. Need to replace the Audiovox cd/radio after the rest of the problems are taken care of.

heyo man i don't have door speakers just little square air vents,but my rear in back of ext'cab are 6x8's only size that fits without moding anything then my fronts in dash are 4" thats sticking to factory size. i think factory door sizes were 6" 8" and 10" for 1987 if your speakers look alittle bigger there 10"S