its about 50 bucks for the kit... as for other brands i dont know....i haven done the install on mine yet but to cover the hole they give u a sheet of metal and you weld it at every x amount inch and u fill in the gaps and sand it down...check out sir micheals website
Why buy one? Before I welded mine shut I just cut into the existing one. If you cut out your og handle,( all the way around the hand slot), in a perfect square.... just weld it into that panel on the inside of the tailgate. You dont need to buy anything to relocate your handle... except for a scrap piece of sheet metal
the only problem with cutting out the handle mount piece section is that you increase the amount of warpage while welding. I am going to try to get a scrapped gate to cut the piece from it and only partially remove the original.