I agree that the pinch weld itself should be taking the weight. On my 2ss convertible, the genuine zl1 addons pads also contacted the area around the pinchweld instead of the bottom. The attached pictures show my solution. A few strips of aluminium cut and inserted. Also used the same strips to stop the set screws damaging the paint and causing issues with corrosion. I know they're flat at the end but any movement of the pads could break the paint. Underseal also applied and the pads attached while still wet to ensure no moisture will get under the underseal and cause more harm than good. Blue locktite used on the set screw threads. All still firmly in place after over a year and lots of lifts by floor jacks and garage lifts
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