what kind of radio will fit 73 duster?

This post kinda got me thinking, I used to have a pioneer super tuner in my old 75 that fit without any cutting. So you can still find them on ebay and I'm sure at yard sales, but you are stuck with cassettes. wow man that's out there!
check this model out: DUAL XC-4100 it even has aux input for new fangled devices like walk-mans or maybe a cd player. :lol: