The Ametek motor was fitted to the lime green and grey/silver non-clutched DC04 and the pale blue and grey DC04i. Every other Dyson DC04 is fitted with what is called a "YDK" motor (part MTR299). If you have a lime green/grey or a pale blue/grey DC04/DC04i (without a clutch), and it still has the obsolete Ametek motor in there that you need to replace, you want one of our standard MTR299 motors and this VCP186 kit, and you're good to go! Throw the old motor rubbers and plastic seal.