.
Ask CTP on here, I got one for a good price, can't remember precisely but it wasn't over £20
EDIT ok I should have clicked your link first, mine was on a PFL which is a much smaller bit of plastic. I need one of those too for my spare FL rear bumper. Probably still worth trying CTP however.
I think I understand your confusion....
In your first link, they are talking about the shiny black bit (sort of) triangular in shape. Often known as a Facelift Bumper Insert.
In your second link, they are talking about the little piece of plastic grill that fits inside the Facelift Bumper Insert, the Towing Eye Cover.
Hope this helps?
Chris at CTP in the affiliates section is a very helpful chap, and his prices are usually pretty good.
.