Looks at the dimensions listed on the CC website- its designed to fit snuggly around the 15** series motors that are ~39-44mm in diameter, so will be somewhat loose on a 36mm VXL motor.
You can buy 10 billion cooling fan & heatsink combos for normal sized motors like that on ebay, tower etc etc- the blower is specifically designed to blow air down through the fins around the castle motors, it wont work too well on a smooth can motor..