 We then carefully made a level...  We then carefully made a level cut through the factory bumpstop mount. |  The air bump simply slides...  The air bump simply slides up and in the factory bumpstop mount. Evolution's upper and lower billet collars hold the stop in place. |  Allen bolts hold the upper...  Allen bolts hold the upper and lower collars firmly in place. RTV silicone is used between the collar and the factory mount. This helps minimize squeaking. |