while trying to order inserts for my in-laws helmet I found the inserts were specific to the size helmet but could be think or thin for the same helmet which may explain why some fit different.
I think the I90 is what my grandson and his girlfriend use I'll check to be sure and he was telling me the other day how mush they both liked them, because I had mentioned that ours are getting old.
Welcome back RiderDuke, we went to three wheels back in 2013 with a Triglide and just bought a 2019 Goldwing with a CSC trike kit on it last month so far we are enjoying it.
Come on down this group is not about what you ride it is more about you riding and fellowship with the rest of us, besides it's been awhile since I have seen the can am up close.