This is the headset that fits your 1st generation Mojo HD, Mojo HDR, Ripley/Ripley LS, and Tranny 29.
Zero stack 1 1/8" upper and traditional 1 1/2" press-in lower. Comes with a 1.5" crown race. A conversion race to fit forks with 1 1/8" straight steerer tubes is also available for $10.25.