Check Olsen's gaskets out in the State of Washington USA, Their web site is http://www.olsonsgaskets.com/. They have gaskets available for the Durant/Rugby style cars. I just got a list from them of what they service and they have them for the 14L and 15L engine. You can probably email them and they'll ship it to you.
Where Are You From? Oviedo, Florida
Do You own a car built by Durant? 1928 Durant Model 65