Ask Eddie Ford, the publisher if he has a copy:
restoredcars@iinet.net.au
Mike, you might be right with the Holden cab...GM-Holden's used the same cab for instance on Vauxhall, Bedford and Chevrolet light commercials 1934/5-6, and in 1937-8 could well have done the same in the heavier line with Bedford, Chevrolet, GMC, Maple Leaf, and Oldsmobile trucks! The ML in the 1937-8 was a 'clone' of the Canadian GMC, with minor differences, and Chevrolet engines. The Olds trucks were also a GMC 'clone' but of course of the Pontiac, Michigan -built GMCs with the Olds 224 engine that was also used in GMCs! You might therefore find the parts you need in a Holden-cab Bedford, GMC, Chevy or Olds!
David