Hi Chris:
Welcome to the 1/2 track club ... my IHC is a RCEME Fitter version but won't get restored for a few more years as the White has to get done first. (When we went to Korea we purchased a batch of halftracks from the US dumps in Japan rather than ship stuff all the way across the Pacific. 2 RCHA used several for OP and CP vehs)
Cornbinder parts are harder to find over here but Gary the 1/2 track man (
http://www.halftracks.com/index.cfm) stocks some IHC bits.
Pray you don't have to do the rear brakes... tracks gotta come off for that one! Yikes, major work!
On Lend Lease: Canada was a leasor not a leasee. Stuff we got from the States was purchased or traded for. If I remember correctly we even ended the war with a positive balance of trade.
Good luck with the restoration, Cheers! Mike