ANY pin style T-Top will fit your 91. They made a couple different sized "pins" on the T-Tops,... but the T-Top mounting brackets are the same for all of them. You need to avoid C&C (Cars and Concepts) T-Tops as well as the early factory 82-83? "hook" style T-Tops.
I've got several glass sets avaiable from $40 a piar to $125 a pair + shipping.
Glass T-Tops are pretty big and heavy and I'm not sure if they will be under the size limits that are imposed on Packages getting shipped to Canada. I think the US Postal limit is 108 inches. If they ARE small enough to ship than it will not be cheap !