6 foot or 7 foot cut Ryan? I also have one ( 1950 6')that is in excellent shape. I will be cutting some wheat wih it in July.I am in central Indiana.Where are you located? I also have an operator's and parts manual for it.I have seen an ad for someone that makes new canvases.Maybe in "Antique Power magazine".I'll try to locate it.Maybe you already know this but if you come up with a canvass old timers used to store them suspended from the ceiling with baling wire since rats and mice just love to chew them up.
Measure the width of top of the sheaves and then measure the outside length of the belts you need and try a Deere or Agco parts store.
There should be a casting date stamp on one of the main cylinder drive sheaves.
There are two pictures of my combine on implement photo site.E-mail me .We should compare notes since there couldn't be too many old Clippers left around.