Those flanges they added are for the wedge to have something to butt up against so only the swivel at the rear of the pin box rotates. If one of those flanges break you will be in a bad situation as both kingpin & rotation point will swivel The catch plate needs to be redesigned in my mind for those swivel pinboxes.
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S.A.Young
2011 321RLTS
2012 Chevy duramax dually
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