There is dress ring that was usually installed with OEM Towbars/Hitches,
I had one on mine but removed it and didn't re-fit it when I replaced the rear Bumper cover.
If you have a Wrecker handy, possible they may have one,
As I have seen them on cars at the Wreckers here in Melbourne.
Personally I always leave the Tow Bar Tongue on/in, as its the "Best Insurance" for the rear of your car,
especially when some one rolls into you at the lights, while they are piss farting around on their phone, as a lot of people are nower days,
and also in some Car Parks,
As they will do MORE damage to their car.
Weigh the costs up, what would it cost to replace the Bumper Cover ? Especially Now ?
I damaged mine [Backed in to a small concrete pole slowly], and had to get a replacement,
I was quoted $400 for the Bumper Cover [After Market], or Repair the old one for $400 , and $400 to respray it in Heron White,
and my excess is $1,200.
So I found a Wrecker on eBay and worked out where he was [in Dandenong] rang him up, and went across and had a look, as he had a few Genuine one's in Heron White, and good condition for $190 inc GST.
[With Reversing Sensors, but I used my original ones]
Got it home, cleaned it up, Polished it, and then Waxed it,
Fitted it.
The Rest is history.
Site Note: Maybe give the Tow Bar and Hitch a Coat of [Spray] Paint, to bring it up to look new.