Good stereo setup for an A body?

If you want front speakers & don't want to butcher your door panels, you can get kick panels that hold 4x6 speakers ( 1967-1976 Mopar A Body Kick Panel Speakers 4x6" No Speaker ) as an example, or these ( Kick Panels for 1964-69 Plymouth Barracuda )
Was personal looking at these what size speaker is better/ more available?
https://www.classicindustries.com/p...Z4HQEDDRCGkI4322FTAaAsPtEALw_wcB&gclsrc=aw.ds