Super Alce Rear Wheel Cush Drive

Hi all, does anyone know the correct sizes of the aluminium and leather spacers either side of the rubber blocks in the Super Alce rear wheel cush drive assembly? Most importantly, what is the thickness of each type of spacer. I also need to know the correct position of each type of spacer in relation to the rubber block, ie in a clockwise direction, is it leather/rubber/aluminium or aluminium/rubber/leather or a different combination altogether?
Cheers Phil