Bobcat should have a page that lists all of their attachments and what models they fit, might take a bit of digging to find it.
There is a quite active facebook group, =AZX10pVtC1LUHhqkKEv6aqqBGs3vr69Nug0GqHoyGoGlmIfdRClbIAhXoOcrspNDHBAOoOuBHFyDLPbzN2Ft92VXabYLwkgmVNO4s6kIQqua3OpNbP2o5wIkT6BqoZGeMCutNMChhG0jQ1HIc16YFQc6SMVS2cwmCzqYMnoKKiSngWu0JEWsWgSARpU3M_9QWJw&__tn__=-UC%2CP-R'] Melroe Bobcat Owners of America that specialize in the older machines, they would know and have items for sale as well.