I was looking through my parts book at the list of speakers and found some interesting stuff.

For my 1966 model they list:

5X7
6X9
4X8
5X10
4X10

All 8 ohm (obviously)



The question is, if my truck currently has a 5X7, can I simply screw in a 6X9 or a 5X10? Are the screw holes in the same location?

 

I'm putting a speaker and stock radio in my truck now - I've got the speaker grille in stripper right now. My speaker choice of 5x7 was dictated by the location of the screw holes in the grille.
Eric