speakers are blown and I want to change them

 

You should try searching. It's a lot quicker.
https://chevroletforum.com/forum/exp...s-g-van-38800/

 

Dash location is not great for any bass. You could swap the factory speakers for some 3 1/2 mids, and put 6.5 in the lower part of the door. Not factory, but worth the effort. When I did my stereo in my 95, I put 6.5 components in the doors, with the tweeter up by the power window switch. I just disconnected the dash ones.