I am in the process of setting up ZJ disc brakes on my XJ 44 axle. I bought this from a member. I am pretty sure that he bought the Rubicon 44 retainer plates. I have read that a shim needs to be made to allow the seal to fit tight. However, the Rubi plates have a lip on them (unlike the flat XJ 44 ones) that is the same thickness as the shim would be. By using these plates do I not need to add a shim before I push new bearings on the axles??