Jim:
Don't have a source recommendation. But just an alternative idea if you encounter sourcing problems for the replacements.
I am pretty sure that the 1980 36 and the 37 had the same boom design. If you are referring to the cam cleats that used to be in spot of the attached picture, then the attached picture illustrates what I did .... actually I removed my jam cleats because I didn't like them. (Sorry - I no longer have them around.) The reef lines run down from the goose neck to blocks at the mast base, then up to standard cleats on the mast. This set up offers two advantages. 1) When shaking out a reef, the lines run better into the the boom without getting caught up on the cleats and 2) when setting a reef, I can pull up on the line (from the blocks at the mast base) to get more tension on the sails reef point clews. This arrangement has been working fine for me.
Anyway just an idea.
