Radio Question

[trukman1]

Does anybody here know if the radios from the 1988-? changeover body style trucks will fit the earlier 73-87 trucks without modifications? I searched google and I can't seem to find if GM used the same size radio. Sometimes they do carry over ( I have a 02 Venture that the panel beneath the steering column was the same as an 07 Uplander.) Any help would be greatly appreciated. I purchased a 1988 K5 from Idahomotorcars with a POS radio. For the record I would NEVER do any business with those guys again. Got royally HOSED!