I have for sale a used Andersen Ranch Hitch Adapter kit. This is used to adapt from a traditional 5th wheel hitch king pin to a gooseneck ball, 2-5/8" I believe.
This is what might be called a FULL kit. This has the offset Stinger, the mount adapter, the whatever they call the screw parts in the middle, its like a yoke type thing. Also included is the chain kit which is not in the kit from the factory. And I don't know if the spanner wrench is included in the original kit or not, but I had to buy one to get this off my trailer, so I will include that as well. And just for fun I will throw in a good sized bar to use with it. This thing is in perfect working order, has some scuffs and scratches, but its a hitch. I went with a different solution for my trailer, so no longer need this.
local pickup, or I could meet at a reasonable distance.