have an '82 Spider needs exhaust system from catalytic converter back - any Canadian parts suppliers? - am near Vancouver,B.C. - Turbospiderwoman

Not sure about Canada, but if you contact Danny in Connecticut he puts together exhaust systems from scratch
Fun imported auto and toys
FIAT

http://www.funimported.com/

You can try Geo at Clemente auto sport. Geo has been involved with these cars for a zillion years. I'm not sure if he would have a set in stock though.
The other is Ital motors in Edmonton. Again the father , Mario, was a fiat dealer in the 60's or even earlier. They might have one in stock.
For quicker service, have you looked at a muffler/brake shop that might make on from scratch? The bit going over the axle has to be spot on though as it could either bang against the body or the axle itself.
I took my cat out and just went back with a 2 inch pipe to the Ansa muffler that hangs too low.... I know, I know Brad
But I don't have smog test issues up here.

i had mine done at a Midas. zero issues, and she sounds great

Mine was done at Midas as well. No issues.

Had mine done at Zorro's in Mississauga Ontario. They do all custom work at really good price's, a lot of Americans come up to have their exhaust done.