Did you try researching the Ametek spec sheet for the blower, maybe it specifies it. Or check the Ametek website for specific information?
Yes, it's a Molex-type jack, but there are a lot of them. The number of contacts, the pin spacing and pin diameter are part of the description. Since you're in the US, and are unfamiliar with electrical connectors, I'd try the local appliance parts store in your area, they may be able to help.
I'll also mention, if you assemble the cable harness yourself, I'd 'key' the mating plug, so nobody accidentally plugs the connector in backwards (that just means plugging the empty hole in the mating plug so that the plug obstruction would prevent the pin on the mating jack from being used, if somebody in the future accidentally reverses the mating connector.)
The best way to do this is to take the blower in to an appliance or electronic parts supply store, and have them match the connector for you. If none of this helps, try to measure the distance between the pins on the connector jack inside the blower, and somebody here will try to help you.