Rear brake drums dont fit diff dr axles

Hows it going everyone? Ok so I swapped out my 7 1/4 rear in my 71 Swinger to an abody 8 3/4 rear with diff dr big bolt pattern axles. The backing plates and brakes are from a 66 Charger rear I bought that had all brand new brake parts including drums. My problem is the drums do not seat all the way against the axle flange. There is a small lip that it will not slide over. Has anyone eles had this problem? I know the drums are from autozone. I will try to get pictures as soon as I can.