GM of Canada has a Vintage Vehicle Service that can provide info on your truck. I've noticed that there are some differences between U.S. and Canadian models, at least in the books. My '52 model 1434 (Chevy 1-ton) has 11-leaf rear springs and 6-leaf auxiliaries, whereas the U.S. model has 8-leaf mains and (I think) 5-leaf auxiliaries.