7 1/4 Axle shaft bearings and seals

Ok here's my question. I have 7 1/4 differential in a 1972 demon. 318 v8 with 10 inch drum brakes. In need bearings and seals . I am dealing with a older parts guy who knows his ****. Some catalogs show different bearings and seals for 9 and 10 inch brakes, others show the same numbers for both. Any one else have this problem before ?