gas cap gx35 honda

Im not positive but try the local auto parts stores, they carry alot of motorcycle and lawn n garden products now.
tried 'em, no luck. staton has a "gx 31" and tat may be a typo. i emailed and called them but they will probably not get back to me.
How about a lawn mower repair shop maybe they have an old one lying in a parts box? you have any lawn equip you can borrow from?
I got one from staton. even the mega store lawn mower supply house had to order them.