Audio Speaker Configuration for 67 Dart Convertible

I took the existing speaker and traced it on a piece of aluminum. I then used a hole saw and was able to place two holes for 3.5" or 4.0" speakers (pretty sure 4" fit). Would have liked bigger speakers and more separation for stereo, but I wasn't going to cut anything up. I bought some Infinity speakers that can handle some power, but driving it now with an old AM/FM/8 track that's probably 5-10 watts/channel if I'm lucky. Sounds fine. I think a member here sells a similar plate.