I believe the 126 300SD springs will fit a 123 and give increased ride height. I'd go with thicker spring pads and oversize tires first though and see if that works. Puttin taller springs on is pretty drastic and may hurt resale value.

__________________
[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.