Last observations after installation...
There is some "bagginess" on the left/right front of the armrest, the cover isn't cut quite narrow enough.
And the cording on the drivers side does not lay straight, it meanders around a bit.
I used some leftover scraps of leather to help hide the interior foam at the rear of the armrest (this was hidden by the cloth cording on the original part).
Also note the color match (or lack of it) in the final installed photo (below).
Overall, the quality was good, but not excellent. I was hoping for excellent since this was supposed to be a cosmetic upgrade.
So... I probably wouldn't do it again. I would either just hack off all my old cording, or spring for another $100 or so to get the original MB part and see how that went.
One concern I have about the MB part is if it's been sitting around for 10 years, it might be in poor shape if it wasn't stored correctly.
Ah well... at least my arm isn't getting scratched up any more!
1999 E320 Wagon