I could've sworn I've seen the sensor sitting on the transmission tunnel behind (ahead of) the radio but maybe I'm thinking of my W124.

And I had the car appraised for exactly that reason, so the insurance company (mine, yours, whoever's) couldn't blow me off with a low-ball settlement offer.
Anyway, here is the "Sixto Gap" before and after. All I had to do was loosen the bolt (10mm wrench), push up on the bumper, tighten the bolt and the gap went away.
Thanks for pointing it out, Sixto.
Jeremy
__________________

"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles
Wife's car
2005 E320 CDI . . 113,000 miles
My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970