https://ftp.jaist.ac.jp/pub/osdn.net/parallelgwas/45012/?C=N;O=A
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https://gulfsouthcustoms.com/curt-45012-class-3-ball-mount-with-pin-2-shank-7-500-lbs-2-drop-8-1-4-long-in-box
CURT 45012 Class 3 Ball Mount with Pin (2" Shank, 7,500 lbs., 2" Drop, 8-1/4" Long, in Box)