Hy IHBoilermaker, you're right they are proving hard to find, the part numbers don't want to cross at Napa or RockAuto. According to my Raybestos master reference guide that truck used Bendix manually adjusted rear brakes. The return spring kit I found is Raybestos p/n H9223 $15.41 at RockAuto. This return spring kit uses four barrel shaped springs per wheel, does that sound correct for your truck? I'll keep looking, but everything I've tried so far has proved fruitless.