The filter can be replaced by following this guide :
https://www.crossfireforum.org/forum...narrative.html

If looking for an aftermarket head unit, look at the 'marine' units, they are usually painted a silver that closely matches.
( Crutchfield or SonicElectronix or Amazon )

Try to find one that has 4 volt pre-amp outputs, that is what the amplifier expects.

This one is quite pretty :