Rear drum part number for a 72 Duster?

I ended up having these drums turned, they cleaned up easily and they work great.
My next question is..... If i have these stock axles re-drilled to the 4.5 bolt pattern, will I be able to buy new drums? It looks like Summit Racing lists 10" drums with a 4.5 pattern, but it says they're for a 72 Cuda.
Thanks.