just installed upper A arm bumpers (537461) on 63 GT Hawk. Left side went on fine, right side "pops out" when upper A arm comes down to rest on the top of the rubber bumper. They are held in place by rubber flanges mounded into the bottom of the bumper, the flanges overlap metal suports on the car frame but when the A arm is lowered, the rubber is pushed towards the outside and one side is releaed from the frame. Can send pics if that would help. I have replaced several of these in the past and never had this problem, but this was the first time they were replaced after the front end was reassembled and silicon spray was used which may be the culprit. Any ideas would be appreciated. Ken Deltaville, Va