If no success you could try Tim Vibert, Empire trading in Winton Vic Australia.
http://www.timvibert.com.au/index.ph...inktext=Ferret
He mainly does Centurion tanks but also B series engines and the post WWII British armour.
Stainless sleeving of cylinders is common very successful process in cast iron cylinders, most specialist brake services in Oz have access to a company to do it if they don't do it themselves. It should be the same in Canada. This mob are in Canada:
http://www.johnstuartpowerbrake.com/...Cylinders.page