Larry,
What size are the drums? I understand some Commerciales were fitted with 12″ rear drums instead of the standard 10″.
According to section 16 in the spares book, 12″ lining reference 438592, 287.6m x 35mm wide, was fitted on all 4 rear shoes, this lining replaced an earlier version which was 317.5mm long, on all shoes.
B……
Bernie