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Unless it's touching the exhaust, the rear bumper is relatively free from vibrations.
I got by with two M10 allen bolts when I removed the pads - they never needed tightening adjustments - 4 years.
When was the last time the sheet metal screws in your rear valance came loose?
Bill K
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73 911T MFI, 76 912E, 77 Turbo Carrera
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