The square portion of the cross tube, as well as the hull opening and removable frame that holds the gaiter outside the hull are consistent between Canadian production UC MK-I* and MK-II*. I have fit these NOS gaiters on a restoration and I am quite pleased with them. They are the latest issue with 1944 date and later five digit part numbers. Placing the wiring on the outside edge wiring channel of the cross tube is critical to proper function.
I was surprised how little the cross tube actually offsets from the hull and still produces a noticeable steering change.
See also the work Super Dave is doing at post 95:
http://www.mapleleafup.net/forums/sh...4&postcount=95