Turnigy 3994 water jacket?

Picked up this motor to test in my 1/8th Scale but I am having a problem finding a water jacket to fit it. I bought a 40mm by 70mm from the OSE store but it is too big around. The motor is 39mm and I cannot find a jacket to fit it. To the racers that have this motor, what jacket are you using?

Thanks,
Buddy

I have the same issues with the Het Typhoon motors where the diameter of motor is not a match to the cooling can. easy fix is to use thicker o-rings which takes up any slop.