I think this might be the worst engineered part of our cars. Once you pull out the rear interior quarter trim (Coupe only) it will never fit correctly back into the strange piece near the window. )Please ignore the fact that the colors don't match each other.)

Does anyone have a solution to this?

If/when you figure something out I'd like to know. I've got two W123 coupes with the same problem. I've been toying with the idea of possibly using a 3D printer to make a new bit.

Maybe making a mold and forming one from fiberglass? Don't know how well fiberglass would hold up to U-V rays.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now

This morning I took mine in to a body shop to have them look at it. He said, "Oh, I can fix that in ten minutes" We'll see about that. I'll pay him $100 for his "ten minutes" of time. I'll let you know if he does it and share with you. Also, let me know if you make any progress. First world problems!!!!

Would love to hear progress!

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1983 300D Midnight Blue
4 speed, W115 intake mani, non-EGR exhaust mani, KKK K26, 3 pc Euro bumpers, Lo-spec Euro headlights, AL129X, hubcaps, custom A/C

1987 300TD Smoke Silver
Euro headlights, thermostat relocation, coolant bypass mod, rebuilt Becker + Jehnert + Helix audio, OEM Oris roof boxes and surfboard racks, Euro towbar

1983 300TD Reed (Moss) Green / Dark Olive MB Tex Euro spec

1983 300TD Silver Blue / Blue cloth Euro spec, OM648 and 722.6, 15" hubcaps, W126 S2 brakes

Subscribed...

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)

I have owned 3 w123 coupes over the years and on all three needed to pull the rear panels to repair the window mechanisms. Unfortunately I only came close to a good fit when replacing the panel.

Well guys, I have good news and bad news. My guy was able to fit the pieces correctly. The bad news is that he couldn't tell anything other than "magic" as his way of doing it. But, as you can see, they are well fitted. I gladly paid him $140 to do both sides. He also corrected the color. (BTW, it would sure be nice if there were an obvious way to rotate a picture to the correct orientation)

I wonder what was the magic he used? Some kind of spreader?? Can’t be that out of the ordinary, though $140 is probably 1-2 hours of work.

You don’t have a location. Who/where is this guy located? Folks with coupes might want to line up his expertise if ever in the neighborhood.

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)

I'm in Provo Utah. USA

Bummer. A bit too far of a drive for me.

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)