I got sent some "SECRET" drawings from the 50-60's on proposed Canadian Centurions. I'll see if the guy who found them is OK with me posting them here. They aren't very detailed, but to give you an idea, Canada was looking at
- vertical launch ATGM version (probably SS-11)
- 155mm SP Gun (think son of Sexton)
- troop carrier
There were a couple others too. I'm thinking about adding to my Cent what-ifs to include the 155mm version, a tracked Honest John launcher, and something along the lines of the S-125M "Neva", a T-55 with quad SA-3, but obviously using a Centurion and for the missile, some kind of extended range HAWK or something totally made up.