speakers for a 'cuda(early A BODY)

I have a 65 Cuda and I've decided that I'm not even going to put the back seat back in. Some form of speakers will go back there. My car will end up being a 2 seater by the time I get it on the road. The back seat is pretty much useless anyways unless you have little kids. Mine are both off to college this year so they ain't getting no rides in it before I'm done anyways. The wife probably won't want to ride in it either and that's OK by me. I'm building this car for me and nobody else. ;)