Does anyone know of any differences between the rear mufflers off a 123 vs. 126? I need a replacement to sell my car and found a used one off a 126. will it work?

Dunno. They're similar but not the same. The 123 muff might work on the 126 and vice versa not sure. I think the 126 may be longer and discharges to the side like a 123 wagon. I have a nice on off a 123 wagon iirc. I'll let it go cheaply but I am not 100% sure it will work on a sedan.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.