Hey guys I only got my car a few weeks ago and it went for storage a week later. Anyways,....IM collecting parts and wanted to know if someone could tell me what size are the stock speakers in a 93 z28? im guessing the back ones are 6x9"

 

I believe they are 6.5s all the way around

 

They are GM 6 3/4 most aftermarket 6 1/2 will fit, they usually have extra tabs for GM 6 3/4 applications.

 

My fronts are 5 1/4 and the rears are 6 1/2. You can fit a 6X9 in the rear speaker hole with some modification to the sheet metal under neth.