One thing is for sure, the diff bolts are too short as mentioned. Another thing is that looking at the Readylift catalogue, it seems to me that instead of 69-5060 I got the rear spacers from the 69-5015 kit. They sit on top of the coil spring and seem to fit, but I'm not sure they really should be used. I haven't had a response from ReadyLift in a week and will call later today to see if I can get a response on usage. I'm worried about ever buying from them again as I start installing elevators/levelers for customers on a regular basis.