It's a pinbox, not hitch pin. Regardless, I couldn't get any of those numbers to match up with the typical Lippert four-digit numbers 1116, 1621, etc. I suggest you call Lippert directly.
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--2005 F350 Superduty Crewcab, 6.0, 4wd, short bed, 3.73 gears;
--2016 Montana 3711FL, 40'
--2014 Wildcat 327CK, 38' SOLD