The main feed chain is an agricultural roller chain type. It's damn near impossible to find in North America. But we stock it in our BC warehouse. We have lots of it and like to share. Let us know how much you need.
Sold in 5 metre sections. For those who aren't fluent in French like most of us Canadians, 5 metres is 16.4 feet.
Roller chain is sold with one extra connecting link.