First of all i know this hould go in the Audio forum but i didn't get much help there.

Anyways if replace my speakers in my 95 with BOSE system can i use stock wiring or will i have to run new wires. Also what size is best i have seen 6.5", 6.75", and 7" recommended.

Thanks

 

you can use the stock wires, you'll have to splice in the wires though.

6.5"-6.75" will fit perfect. maximum mounting depth 3" with stock bose speaker bracket.

 

i ran some 6.5" infinity coaxial speakers off my bose amps, they sounded great..