Are these consecutive serial numbers the point of demarcation for the A risers ? Last of the first model, Raised Heel Ridge A-2038 (RH); & first of the last model, Low Cut Shelf A-2039 (LH) ? 

Or do Raised Heel Ridge risers exist with serial numbers higher than A-2038 ? Or do Low Cut Shelf risers exist with serial numbers lower than A-2039 ???

Needless to say, I am looking for risers A-2037 and A-2040 (it was shown in the 1971 Bear Catalog), as well as for any limbs with serial numbers 2037, 2038 or 2039.

Wade I have 54 not raised.

Thanks so much for posting that information Jim. I knew you had that number riser, but not know it had the low cut shelf. Haven't had time to follow up with contacting everyone as busy babysitting over 400 roses now that it has warmed up.