I would tell Santa that he would be in trouble if he didn't bring one. It was my favorite purchase for my TT.
I purchased the 2 1/4" and just enlarged the existing hole to fit. I was not sure of which size I needed when I got mine. I purchased it thinking that if I purchased the 2" then there was no way I could use it with a 2 1/4" opening. But, I could always enlarge the 2" hole to accept the larger diameter jack.
2011 Ford F-450 4x4 Lariat
2013 Sandpiper 365SAQ