Here is our new radius arm clamp mounted on our axle. It took a while but we finally got these on. We used the old radius arm clamp bolts to pull both ends together and then loosened the bolts and replaced them with the new ones that CAGE includes. The bolt holes do need to be elongated a bit but its nothing a long round file and drill can't take care of. The axle bushings have a specific position but they are marked on the inside with the corresponding positions which read either "front bottom" or "rear bottom." A word to the wise-it makes it easier if you mount the CAGE head radius arm-to-head unit bushings while the head unit is outside. Otherwise you'll need to fumble around with it until you get them in place like we did.