fester - It was a good thought and your install looks good, but that Curt unit won't fit the '54 3100 frame dimensions. '54 rear frame width is 46-1/32" (outside to outside edges) and your '59 (same as '55.2 Series - '59) rear frame width is 34" (outside to outside edges).
treegrower is going to need find a hitch that spans the wider rear frame width and still drops to the correct level to fall below the bumper, unless he's looking at going bumperless in the back side.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)