If You can't find one at flaps, if You have an engine rebuilders shop close by go there they would have them and know the size,I got all of mine from a local rebuilders ,he cleaned the block and the bare head for Me and I had Him install new cam bearings so when I was there I got the freeze plugs from Him,he had a book that had all the sizes in it and He had every size youl'd ever want.
Pete
