B-Body Axle?

It appears I may have been wrong again. My casting # is 3723599 which is definitley a 8 1/4 axle but from my research could be an A-body unit. The dimensions are correct for post-72 A-body 8 1/4. Just trying to identify the brake shoes it needs as the first set I bought are incorrect and to have NAPA order the correct ones I have to identify the year-make-model of the brake shoes i need. Thanks all for the input!:coffee2: