Hi. Do you still have the Bose radio head? Not sure if yours is the same. I'm looking for a Bose Radio Head RX7 1994 for parts. Doesn't need to be working. Just need the Bass/Bal button. See picture.
Or if anybody knows where to order parts... I've been looking online with no luck. Any info is appreciated.

 

You can still get the Bass/Treble **** (FD01-66-BC2) and the Volume **** (FD01-66-BC1) from Mazda. I'd give Ray Crowe a call at 703-785-5554 and he should be able to set you up.