Look for rotors from an 88-98 K1500 Chevy truck or the 99 and newer trucks. They have the same 6 lug pattern as the early 1/2 tons.
As far as caliper and brackets go, well you'll have to fabricate that yourself.
Maybe try a u-pull yard. I got a complete set of calipers and rotors from a GM van for $30. If they don't work, at least you aren't out much.
