Anytime you are looking for an exact model, in an exact year, with an exact glass collor, in a narrow weight range (especially in the heavier weight range); it is going to be hard to find.
With that said, you could also get luckey and find it the first time you try.
However, 55 -60# in and Bear model will be hard to find, I think Bear made more 45# bows than anything. Hunting bows anyway.