I bought a 93 Warrior 4 years ago - picked up some MKD303 from advance auto parts at that time - $26. After I took a closer look at the pads on the camper & decided to wait. Just dug into the project (still some surface left) and found that the 1 of the 4 pads did not have the little holes for the springs) & when I contacted Advance found the pads were no longer available,
Autozone could not get any.
Anyway, NAPA had a set of their basic pads - part number TS-7321-M from their tampa center.
I bought 2 sets of Bendix MRD303's from RockAuto - they were private label discontinued --- pretty cheap at about $7 a set. I think I got the last 2.
I did see some similar Bendix sets on ebay in the $40 range.