Welcome to the world of old Dodge trucks! You can't just open a catalog and your wallet to get what you want.

That said, the stock brakes in good condition are fine for commuting and light hauling. What's your goal?

BTW, the 12" brakes are for 8 lug rear ends only. The hub is almost 4.5" in diameter, no room for the small lug pattern, even the 5*5.5" pattern doesn't clear.