Denny,
Is the width of the 3600 rear spring leaf wider than the 1/2 ton rear springs?
I think that Greg_H might have a lead on someone who is willing to make the "shim". I have many spare 1954 spring packs and the smallest leaf might serve well as a shim. It is about 1/2" thick (probably less). Within a month, I will be putting the front and rear axles on the 1954 1/2 ton that I am restoring (with new spring assemblies all around). I'll know better then what might work.
