I would first look for corrosion/rust in the receiver that may be blocking your new shank from sliding into the receiver tube. I'd suspect that it's machined with "just enough accuracy" to function, but likely not a "precision fit". That said, it should slide into the receiver tube without modification to the shank.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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