I ordered these bolt-on push prop adapters for a set of SunnySky X2216 motors. Even though the description says "V22" they will most definitely fit on "X" series SunnySky motors. What's more, they come with the prop cone, which the stock motors didn't come with. So now I have some spare motor hardware in case I need it. I use a paint pen on the tip of the prop adapter, the prop adapter bolt, and the prop nose cone to differentiate between my push prop adapters and my regular adapters so that I don't mix up hardware or try to cross-thread the hardware.