Badger wrote: Where can I find replacements for the small diaphrams on the carbs?
I thought someone else might have obtained these before and would have answered your request. After a few days of nothing, I decided to "go shopping " to see if I could find them. There's one on EBay for $119.00 US. Ouch !!. I also found this website posting them at $13.20 a piece. Might be worth checking out. Hope this works for you. Let us know if you do manage to get them here and at what price.
Air cutoff valve (small diaphragm on carb)