Made by Tower in a Box. Very heavy-duty universal sailboat arch for mounting solar panels, dinghy davits, StarLink, etc. Full installation instructions and videos available online. Arch is adjustable to fit your boat (see mfr's chart in images)
The model number of this arch is TIB24350. It is the heavy-duty option with Schedule 80 tubing. See manufacturer's chart in the images here: This arch sells for $3850 plus tax and shipping. So well over $4000 replacement cost.