RVGC-4210A 5th wheel Kingpin Box for a Gooseneck Hitch fits Lippert models 1716, 1116, & 0115.
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If you want to know the location of the gooseneck trailer coupler using the new king pin box (because these king pin boxes fit several different models) below is how to calculate the location of the (top center of the gooseneck ball) coupler.
From the center of the most forward and lower bolt hole (on the king pin box of your trailer) measure forward 19-3/32” and and down 19-1/16” to 23-9/16”. This will give you the location of the center and top of your gooseneck ball with your new adjustable 5th wheel king pin box.