i own a 77 230 and posted on another site that i'm looking for quarter panels.i got a reply back saying that it was a 123 body style and parts were easy to come by. i have had a hard time finding other 230s' so i was wondering if the panels from another sedan would fit?

Yes.

Any panel from a 123 chassis will fit. The only ones that might be hard to find are rears if you have a long wheelbase version.

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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k

so this would mean that any 77-85 300D or 240D will work for you.

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)

Or 280E.

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Auto Zentral Ltd.

Or buy new replacement panels from Sherman Parts.