Compatable parts on post war models are marked as (A) in their descriptions on 'single' & 'twin' sections
Smaller inside diameter suit Series 'A' hub and with 5 sprocket holes.
Note, Original Series 'A' and early 'B' drums were pressed steel, these drums are made from cast iron to the same design as the later post war drums and the mounting face is thicker. To get the correct bearing housing fit these housings will need to be machined to suit.
All drums come unpainted