I had a W123 with similar damage years ago.

We needed to replace the core support, and I had a parts car.
I bought a new one from the dealer, so it must have pretty reasonable....

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles