Radio installation help!

The twin shaft style radios haven't been made by the usual car stereo companies since the late 80's. Everything these days is a 7" x 2" rectangular unit, called DIN size. There are also double DIN sizes, but those are for newer cars. You can install a DIN sized radio in your dash if you are willing to cut the rectangular opening. If you don't want to cut the dash, then you should consider a system that plays music via bluetooth and can be hidden away somewhere. The hidden systems start at around 300 bucks.