While restoring my Tillotson Sp 13B carburetor I found the below company on EBAY that was advertising Gasket sets for various model Durant Tillotson carbs. In an email he stated he was working on some needle valves also. He did not advertise my particular carb but upon emailing him he advised that he could make one up. I purchased the kit and it was complete, with gaskets, Fiber washers, filter screen etc. I'd give him a call or email if you need to rebuild your carb.
Discount Marine Parts LLC
P.O. Box 98, 4524 D Road
Bark River, Michigan 49807