a phone call is best, but worst case, just go to home depot and buy the 2" and 3 1/2" drop/lift hitches, and return the one(s) you don't use...
oddly enough I found a couple of nice hitch's with balls on CL, was about to go to HD and buy a 2" drop and decided what the hell, and checked CL, for $20 I got a 2" and a 3 1/2" both with balls for $15, (and I saved about a gallon of gas too) guy was about a mile from my house and had sold his boat. so now in my rear storage I have 3 different drop's,,, with different sized balls, so i'm ready for any trailer that comes my way.