This is for JB. I have 2 Xtra 10 suspensions (not sure of the chassis origin), one is the 133 and the other is the 136. From what I can gather the 136 was used in the 97-99 700 RMK, 98-99 600 RMK. When placing them side by side the 133 rails are flatter, rear torque arm location is different, and springs are the same length. I am planning to mount the 136 in a 1989 Indy Trail chassis and have used the 133 incher for needed parts front torque arm and some cross shafts)to complete the 136. I have visited your site (excellent by the way) and have printed both sets of drawings for the Xtra 10 swaps. However, I am still confused when I compare them to a 1997 XLT SKS Xtra 10 mounting locations.