I know this is an older thread, but my rear speakers started buzzing a few weeks ago, so getting around to changing them. I pulled the 6x9'* out (pain in the *ss). I think they were meant to go in and never be replaced. Wound up having to trim the package tray since the holes were much smaller than 6x9 around in order to get the old speakers out and get the new ones in. Turns out, the new ones won't fit into the same mounting spot because they are much bulkier on the outside diameter than the originals. (project for another day)
So I did get my 5.25 out of the rear doors and on my way to the local Circuit City for replacements. Looked in the owners manual to see if there was a watt rating on the Bozo head unit (Bose cheapo'd out for GM), but no luck. My only fear is I'll get some hi-watt speakers that the head unit will be unable to drive. Anyone have suggestions?