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There are two layers of metal: a thin sheet metal on top and a thicker (guess about .120) reinforcing plate underneath. If you weld plates in I would suggest doing whatever you have to in order to ensure you hit the bottom plate with your weld. It's really not hard to do, just turn the welder up to get proper penetration on the plate underneath and you'll burn right through the sheet metal.

The other option is Ground Control's bolt in plates. I think they're the best out there for Z's at this point, because they don't have the weight of the car sitting on the 5/8" monoball, and the newer ones allow the spring to stay straight underneath the plate, so the spring doesn't get bent sideways and rub the threads on your coilovers as much.


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