I've had to replace a lot of LB/RB bumpers over the years (considering the Elite controller has a horrible design that Microsoft won't fix) and I can confirm that these are quite a few of them were mostly the poor. First of all the silver paint color on the items I received was very different than it should be and while I understand it's difficult to match the aftermarket products accurately they were a long way off and that's what made them so cheap. I try not to be too picky so I can live with such coloring. However, after I reinstalled the bumpers, I found that the mold had just come loose. I had no trouble putting them back in place but the shape of the bumpers hit the triggers rendering them completely unusable. I removed this item and replaced it with another black aftermarket bumper kit that I found and with no modifications it fitted perfectly. I would advise discarding this item and looking for another supplier.
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