G'day Sid,
nice outfit, well done.
Re the hubs, I think that the PO has either modified or changed the swing arm as well, as the axle holes are different sizes left to right.
The brake shoes are 7" X 1 1/2" Pt# 42-5620 front and back. The '59 are front 8" X 1 3/8", rear 7" X 1 1/8". I love the Ariel hubs on my cafe, a lot lighter and stop real well. Easy to set up with the adjuster.
Cheers