Wanted - One 81 XS400 valve cover cap

Hey!
I somehow managed to broke one of mine, so if you have one extra and you don't want a fortune for it and are willing to post it to Estonia, I would be very happy.

Can anyone confirm if the cylinder head cover caps from Honda CB350 fit on our bikes?
http://www.ebay.co.uk/itm/Honda-CB-...090228?hash=item1c712145b4:g:A8EAAOSwYIxX7KzG