Brake lining dimensions are given at the back of the Brake section in UC-F1 as 3/8 thick, 2-3/4 wide, 12-1/4 long.
I have had sets bonded before. If you have your drum turned by a known diameter, you can have an equal thickness of shim installed under the lining to get the proper arc, but in that case you will also have to rivet as opposed to bonding the linings to the shoe.
Personally, I have always turned the drums clean, had the shoes relined, then had the shoes ground so they fit into the arc of the drum. They will still need to set themselves in to some degree, so don't expect perfect brakes right off, and expect to have to re-adjust them a time or two as they fully set in.
The braking/turning power of a clean set of drums and shoes will not be experienced with grooved drums. Surface area is the key.
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