I built an aluminum patch to the same dimensions as the tire carrier. I used an old beat up truck box from a rolled Ranger. Cut it into the trapezoid shape, polished it with a wire wheel, hit it with some aluminum wheel cleaner, clear coated it & bolted it up with some stainless steel bolts. It turned out pretty well for the cost of a few bolts & washers.
Plenty of vendors offer replacement patches if you want a manufactured look.
Black Forest Green 2012 JKU Sahara - Used to love her, had to trade her.
Rhino 2016 JKU Rubicon Custom. MT, 3.5" Metalcloak Lift, Metalcloak Full Width Front Bumper, Atlas Rear Bumper, 315/70/17 Duratracs on 17x9 Warlords