The davits came with the boat and goes back 2 owners to the original in '99 so I have no idea who made them. The pictures are just for ideas. And yes, they are ugly and add 5' to LOA. I have a 43' slip and I use the whole thing between the sprit and davits/dingy.
Here's a shot of the thru-hull connection to the aft berth while I was making some mods -