PDC Sensor Cover

[Robot Ian]

Hi All - apologies in advance it I'm posting this in the wrong place.

My e53 is a 2002 4.4i in Steel Gray Metallic.

I'm missing one of the plastic coverings that go over our rear PDC sensors. Specifically, it's the inner left cover. For clarity, we're talking about part number:

51128268367

The number above links to the parts diagram - number 6 on the illustration.

So I'm missing this thing. And I cannot find it online for sale for anything less than 30 bucks. Which, I'm sorry, just seems wrong. I can literally buy the ultrasonic sensor itself for 5 dollars. But this plastic doohickey is 30 plus shipping.

Anybody on here have experience with these? I called a dealer and they quoted me 40 plus tax. Which is...again...really?

Before I go to the junkyard hoping to get lucky, can someone tell me I'm just looking in the wrong place? Anything. Just talk me off this ledge. I can't even find a busted looking used one to repaint.

I'm totally open to someone saying "Suck it up and pay the 30 bucks, BMW Boy". Would just rather hear it here first before shelling out.