You listed your vehicles, but you didn't tell us what tractor you have!!!!! Doh!
I'd look for a radio from a farm supply place. Fender mount, or under a canopy, different styles, but around $100-150. TSC, Fleet & Farm, etc or any of the popular mail-order places. Your dealer probably can get the exact same radio, & would charge an extra $25-50. My experience anyhow, depends if he is worth more money to you for the same product.
For a hitch, you have to tell us what you are looking for, do you mean the 11 hole drawbar that goes on the arms of your 3pt? Should be about 1 shelf over from the radios at the farm supply place. Again, dealer will have them, same item for more money.
If this is a swinging or stationry type of drawbar specific to your tractor, the dealer is the place to go most of the time (or junk yards), & be prepared to spend 2-3 times what it should be worth....
--->Paul