http://www.princessauto.com/pal/en/Boat-Trailer/3-1-2-in-End-Cap/8095150.p

This is an end cap for a keel roller on a boat trailer. It's 1 3/8" tall, 3.5" wide, made of polyurethane and fits rather nicely on top of a Sportage body mount. Not as nice as a 4crawler kit, but for $3 apiece I couldn't say no. I'll post install pics sometime this weekend.