Governor Fly Ball Spacer to replace Onan 0150-2178 or referred as a "spider/ spacer". This spacer fits many Onan applications P, B and N series) Here are some ( P216, P218, P220, P224, B43, B48, NHC, NHD, NHE. This spider has 1 longer "ear" to fit in the "notch" on the cam gear. If you have cam gear part # 105-0700 this spider will work with your cam gear. Not OEM ONAN. The fly ball spacers were engineered and Built to OEM specification all done within the same company. These are made of Aluminum. MADE PROUDLY HERE IN THE USA. The cam gear is not included, only for reference! You will receive 1 Fly ball spacer per order. The fly ball spacer can be pressed on to the cam gear or you can use a rubber mallet to install onto the cam gear. Any questions please email me.