I know they fit on a 86 cavalier but I don't if they have the same bolt pattern as a 91.
Try to get that info from the net, canadian tire or something and I will email you my info later if they fit.
I used to have 205/65 on those and a friend of mine had 225/60 on the same type on rims but I'm not sure if they are wide enough to fit 235/60.:dunno: