A couple of years ago, I scored a factory hitch on ebay for $75 from a junkyard about an hour away from my house. I went to pick it up, I asked about the bezel, and they threw it in for free! I installed it without a problem. ..The bumper was really easy to cut (the line to follow is molded in the plastic). I did it in a couple of hours. I didn't buy the factory wiring, mainly because I've heard the install is pretty hard and the dealer has to flash the software, and it may not work right even after all that. Besides, all of my trailers are the 4 way plug anyway. So I bought the curt wiring that attaches to the tail lights. The receiver did come with the plastic hinged cover for the 7 way plug, so for a finished look I dremel'ed out the back side and ran the plug through it. It great for about a year. One day, I didn't have the keys but wanted to hook up the boat trailer. As I rolled it out of the garage, the trailer tires hit the drop off between the floor of the garage and the drive, causing it to shoot forward and the tongue hit the plastic hinged cover, causing it to break off as well as bend the steel mount. The wiring was fine, and I tried to bend the bracket back the best I could, but the plug was left hanging.
A couple of days ago I noticed the plug cover had come off somewhere, and the snowy salty weather had caused the plug to corrode. I began looking for a solution, and came up with this little thing.
Since the hole required for the adapter is smaller than the one in the hitch, I fabricated a cover out of some scrap aluminium and cut it out with an angle grinder.
After a little paint, I plugged it all in and taped the plugs to try and cut down on future corrosion.
Then installed it in the factory location.
Granted, the hitch needs some paint, so I'll get to that when the weather warms up enough to take it off.