They can not or will not supply the needed specs. They didn't sell the shank individually. It was part of a $200+ part they wanted to sell you so you could change out to a 2" hitch. The part they wanted to sell you has been discontinued and is extremely rare and hard to find. They 917XTR, the little brother to the 916XTR, has a solid steel stinger and Thule didn't made an adapter (2") for it so you were stuck with buying the $200+ piece. All that is needed was the 2" shank. Everything else was the same. So, I'm going to make my own. It's fairly easy. 1 piece of 2" square tubing 18" long, drill 6 holes, spot weld a hitch pin nut and Bob's your uncle!