I would try to find a replacement part first from one of the full-auto parts companies in Canada first. They aren't making them anymore, but not guys aren't wearing them out either.
I once went into my favourite gunsmith's with a cracked G43 firing pin housing and asked if he could weld it up. Just a sec' he sez, and disappears. He came back with one from the parts bin, leftover from the previous shop owner. He didn't know what it was. It saved a possibly weak welding job. And, he got $30 for dead stock.