560 SEC seats will bolt to your current 280CE 300CD coupe rails, or you can hook up all the motors.
I just got 560SEC AMG recaro racing seats, with complete inteior that I want to put in my 300CD, so I am looking for a w123 coupe with a black interior so that I can just put in the seats. I think I can put in the SEC back seats, but I will have to make a center console, which is not a big deal.
How is your project, I know its an old post, but maybe you will read it?
No Benzes in the stable at the moment, but itching for one again.
Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold