Well,
Assuming you want street weight glass - AAR and Glasstek would be my two choices.
Race weight glass- Sled City is my only choice (but they are limited to popular Mopar makes)
Carbon Fiber - Cynergy Composites (for A Body Cuda FB only).... big $$$$$$$$
If you do find a CDN fiberglass panel dealer the exchange rate, shipping, duty, and federal and provincial taxes will be baked into the selling price . So either way you are going to pay somebody a silly amount of money.
I try to make a large Mopar meet in the USA, pre-buy my parts, pick them up from the event, and drag them home. You save shipping and any possible discount offered. When you get to the border tell the CDN border agents you are restoring an antique car and the duty and taxes might get waived.