Hey thanks for your help, folks.

I bought the parts manual and it does show a twin-shoe brake for this vehicle. I found an inner shoe 3694570 and most of the linkage parts on eBay, but I haven't located an outer shoe 3694574 or a couple of the other components. I'll degrease the assembly on my truck and take some more photos to share. Could you recommend any likely sources to find the missing parts?

Sorry for the delay in my reply!

Last edited by charliesixzero; 09/13/2018 3:44 PM.