Kimbrough doesn't fit for sure. The gears are too thick to fit in the spur pulley.
This isn't really necessary, but don't forget they also have a 19T belt and pulley option to convert your internal ratio from 1.9 to 2.0 if you prefer.
http://www.tqrcracing.com/shop/produ....asp?p_id=6520
I have one and I like the way it feels, but again, just a personal preference.