That's cool. Yeah like 6" or 4x6" or whatever it happens to be. Looking through the grate, the fronts look almost identical to the '95 Regals Concert Sound II setup...
I have a 99 Ext cab, w/out the Bose system and it takes a Component speaker system in the front (I think they are a standard size: 6" and tweeter) and a 4" x 6" in the back. Trucks w/ the Bose take a 6" x 9" in the front and the same 4" x 6" in the back. Hope this helps.
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