I have an 87 w150 with an aftermarket head unit and its got the 7 speaker setup: 2 in each door, one in dash on passenger/middle, and one in each cab corner behind the seat. I don't want to go all out and tear it part till I got the new speakers in hand and I was wondering if anyone knew where I can find the stock speaker dimensions because ive tried with no results! the only two that work in the whole truck are the ones behind the seat and it just sounds like its playing through the built in ipod speakers and its really annoying! any help is appreciated!