I'm with Squiggle on this one. Yes, they are insanely bad on a W115, but on a W116.. well.. they are impressive in a Teutonic way, and they might actually protect your bumpers a bit as well.
I have seen a lot of such protectors for sale over they years, many of them, if not all of them, designed for USA- bumpers. Never bought them, because of the united fashionistas here. Hard to tell how big they were. Never saw anything else but MB-numbered protectors. If these are aftermarket, good luck finding out who built them, and where to get another pair.