Hi there,
The carbon gear came from Ripmax in the UK. The gear including the 2 1/4" wheels give me 6" of hight to the top of the UC. Add to this the 2 or 3 " to the centre line of the motor shaft and a 14" prop fits easliy, you can also take it off the ground on a bumpy uncut grass field.
You could try Carbon Copy in the UK. If they don't have it they will build one.
http://www.carboncopyuk.com/
Cheers
Kris