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Just be as gentle as you can when pulling the bumper off, and hope you're lucky. The tab furthest from the wheel arch seems to be the one that goes because there's very little to it. Mine all looked undamaged visually, but still sagged when re-fitted. I've seen people fit the metal reinforcements and it make next to no difference. See how it goes, you'll know as soon as you clip it back in if it's right or not and it shouldn't damage the paint if you then have to put it on and off a few times as you tweak. I'd send it to a skilled bodyshop who understand how to manipulate these things, and have them remove it and do whatever is required to make it fit perfectly.