Large bolt pattern axles

It's possible to order aftermarket big bolt pattern axles with the smaller brake drum register and properly machined bearing shoulder so you can keep the original small brake assemblies. But it is more common to swap to the easier to find & maintain E/B/late A-body drums & backing plate assemblies. Gotta give the axle manufacturer all the details of what you have & what you want. Naturally, the axle housing width and axle lengths have to be compatible too.