The K&N SP-2704 Air Filter is a conical shaped clamp-on style air filter that will fit Bing 54 and Bing 64 carburetors commonly used on HKS, Rotax, Jabiru, and various other engines. The SP-2704 is like the RC-1200, but with a rubber end instead of metal end as well as a tab for attaching safety wire. This is Rotax Part number 825553.