Same thing happened to me.
The red cover on this one from Amazon matches perfectly with the cross in the middle and the bumps on each side.
However, it only comes with a white housing, and my Vegas has black housings
But, like you, I only needed the red cover.
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
Looks like its a few dollars cheaper if you order directly from manufacturer
https://lumitronics.store/lumitronic...rs-5th-wheels/