I don't know how urgent your need is but I have a 1920 case and cylinders I am using as a spare/parts engine for my motorcycle cannonball endurance run October 2016. If you are still in need and I have not "consumed" it during the run I would be glad to talk to you about it for your project. If you find something before then it would be great but at least this may be an option. It took me nearly a year to find and obtain my spare and I wasn't picky on the year since so many parts interchange. Good luck in your search and keep me posted.