Newbie with hitch question

[Mamadoc]

Hi, am awaiting arrival of a vintage cruiser 19ERD. I'd like to use an Andersen hitch but the dealership has not been able to supply me with the required measurements - ground to top of coupler, and height of the frame itself behind the coupler. I know it takes a 2 5/16" ball. I'm towing with a Jeep Grand Cherokee Trailhawk, with a 2" diameter hitch receptacle that is 21 1/4" from ground to top of the receptacle. Anyone know which Andersen hitch would work? I need to order the hitch and bring it to the dealership to install. Thanks!