Just to clarify a point, if you take Altech's advice, and find that you do still have an older style "plastic end stops" ARB and find that it is nearly u/s, you will always need to replace the ARB mounting bushes as the diameter of the new ARB at that point is now smaller due to there now not being a plastic end stop "tail" thickness of plastic on top of the metal of the ARB. The other reason that Altech would have mentioned "changing ARB" is that a lot of labour time is saved if you do both these jobs at the same time. Just to round off your growing list of things to change, maybe its time for some new ARB droplinks as they fail frequently, cost pennies and get disconnected at one end when the ARB is being replaced - Christmas has come early for your car!!