I bought the router before my Mini Mill got here, and Amazon had a newer model of the Colt that is 1.25hp (GKF125CEN), so I bought it. Turns out that the OD of the router is just barely bigger than the old one, because it doesn't fit in the mount that came with the kit. With a little bit of careful grinding on my drill press, I was able to make it work though. It seems it's only bigger by about 50 thou, I forgot to measure before I started grinding though. The new Colt is 2.841" in diameter. I might need longer bolts though.