Following the recommendations of those who suggested Mustang places... here are some good google results...

http://www.google.com/search?hl=en&lr=&q=mustang+calgary+canada+"subframe+connectors"+welder&btnG=Search

and here's even a forum thread where someone is asking where they can get their subframe connector and roll cage welded in...
http://www.allfordmustangs.com/forums/showthread.php?s=c70f7600ea48d4241003a06ebbe7720c&t=37931

hope this helps

morbid 2000 Contour SVT (black)