You only need the longer 54mm shafts if you want to run the middle hole on the arm, it gives you back the droop you lose when doing so. If you are running with the short tower and Gold bodies the shafts do bottom out on the top cap before the spring cup hits the bottom of the body, it's worth noting that the car bottoms out before this occurs. So far i have had no problems with my car, it would seem that the extra droop helps mid corner mostly when on power my inside rear wheel was always lighting up out of corners until i did this mod'.
HTH SimonW
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