Hi Billy,
Std
Underslung
Overslung
So Ariel hub would be part of 58
Overslung , first of the iron hubs with cable anchor cast onto the brake plate and arm upwards
underslung, the cable anchor is incorporated as part of the torque stay fastening to the bake plate
Most pattern shoes do not have thick enough linings,
I did not have any success with the floating shoe type
I have not seen a pattern cable that is the same lengths as an original from my 61 SR
I gave the original to the owner of the last customer A10 I rebuilt (61) and he got Johnson cables to replicate it
I must get it back from him
There was quite a discussion about the rear brakes a while ago, Search for it
Cheers
John