What is Reddit's opinion of DUTISOG 2 Pack Jack Pad Adapter for Jack Stand 2-3 Ton Universal Rubber Slotted Frame Rail Pinch welds Protector?

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Bend it back. In the future you need to use the rubber pinch weld adapters like this which is indicated in that photo you linked from the service manual: https://www.amazon.com/DUTISON-Stands-Rubber-Compatible-T43002/dp/B07FFQGB4F/ref=sr_1_4?dchild=1&keywords=jack+stand+rubber&qid=1598228068&sr=8-4

Also, practice lowering the car VERY SLOWLY with the jack before you ever put stands under the car. Dropping a car suddenly can bend it even with the proper adapters.

Also, make sure you put the stand between the notched points indicated in the photo. You cannot and should not just pick any point along the seam. The notched points are where there are additional reinforcements welded into the frame.

Depending on how bad you mangled it you may need to take it to a unibody frame specialist for repair. The pinch weld is many panels welded together with seals and drainage areas to keep it from rusting out. If it's badly damaged it will rust out and compromise the structural integrity of your car: http://blog.garage-yoshida.net/archives/1926

The Garage Yoshida blogpost is about the BNR32 but the same general principles apply. The R33/R34 chassis is stronger there but you can still damage it and cause a crazy amount of rust.

My new car has the folded metal lip that runs the length of the doors, you need a slotted jack pad and jack stands with the rubber slot adapters on them. Otherwise, there are NO jack points to use a rolling floor jack. Saw a friends car after he attempted to use a floor jack, ended just as badly as this one...

https://www.amazon.com/gp/product/B07FFQGB4F

https://www.amazon.com/gp/product/B06WRMSHP2