My boat came with a Fulton F2 jack, but it wasn't installed. I just couldn't stomach the adapter plates I was finding as the least expensive one I found was $76 shipped. I was all set to make my own when I came across this one on e-trailer:
http://www.etrailer.com/Accessories-...n/F500320.html
Only $28 + $7 value shipping. I can live with that. It's 1/2 the price of the other adapters out there!
Picture of the actual adapter: