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You can try to modify your oil pan. That is, to take a solid round object, like an impact socket and hit the oil pan with a hammer (or sledgehammer) to change the shape. I'd only attempt this if the headers are barely touching and you need a few mm of clearance.
You can try bending the headers into shape if there seems to be a large amount of contact. Something probably got bent out of shape.
The best option is to return the headers. There are so many better options out there...
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