drum brakes and moser axles

But the OP says the register on the axles is larger than the register on the drums. From the description on the Moser site it sounds like the axles are for stock A body drums that have been drilled for the LBP. So it looks like he has to not only drill for the LBP but he also has to machine the register in the drums to the larger axle register.

An alternative might be to machine the register to fit the drums. This would probably void any warranty the axles would have but it might be worth checking with Moser to ask them about it.