You will need diaphragm pn 272538S. Two different carb to tank mounting gaskets so date code is needed but it looks like it is probably the 692241. Hopefully you don't the 3 quart or 1 quart fuel tank as they are NLA now. Just that fuel well does rust out making a new to the engine tank necessary.
I have seen a couple carburetors that inhaled so much rust that the carburetor internal passages to clogged solidly which is very hard to clean out.
