RBS stocks all the small parts to fit today's fuel injector's. This arm fits all today's Enderle square and K style barrel valves as well as most other barrel valves that use a 5/16" serrated shaft. 10/32 threads are tapped into the arm the hook up barrel valve linkage. Made from heat treated billet alum. and is black anodized. Also can be used on the Enderle fuel shut off.