Are you talking about your '91 300E? I'd think that should be the same as mine, and the parts CD lists them the same.
Here's the interesting bit from the CD:
Original part:
124 520 88 23 ANTINOISE CAPSULE
Replaced by:
124 520 41 24 ANTINOISE CAPSULE (up to ident #B 747339)
124 524 15 30 PANELLING (from ident #B 747340)
I'm not sure what the difference is, but my chassis # is less than 747339 so I got the first one. I would presume yours would be less than that too being a year earlier.
I got the correct part number shipped too, but it sure doesn't look like the drawing on the CD. Sometimes they don't exactly, but I dunno...
If you're under your car sometime I'd be curious to know the distance between the front and rear (or middle, in your case) screw holes. I don't think my front end is smashed in an inch, but...