Sev, I understand what you mean about the offset. However I installed one of the rims in the front to check tierod clearance and it looked quite right. It was reduced about 13 mm, leaving about 7 mm of clearance. However, since the new rims are wider, the outer face of the rim is about 13 mm further towards the outside of the car. So far that's fine with me. I might get some concentric spacer in 10 mm to get more tie rod clearance.

Back to the original matter, I came across aset of springs of a 1991 500sel W126 non-SLS. According to some spec charts, this particular W126 has a curb weight of 4785 lbs. I beleive my W123 has a curb weight of about 3900 lbs (I need to confirm this). This means the springs in this W126 are about a 23% stiffer, in rough math. Considering my car is almost 10 years older and my springs are "worn", swaping the springs should be a good improvement, right???

I just need to figure out if I should give it a try or keep looking for the 560sel springs. The gut is asking $135 for the 4 springs from the W126. Should I go for it?

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1982 W123 300D NA Euro, 300K Miles, 4-speed manual, 3.46 rear diff, early W126 front brakes, Penta rims with 205/60R15 FH900's, custom fitted (by me) audio system, more to come into the money pit... Soon to be installed: Bilstein HD, R107 front discs and 4-piston calipers, HD Suspension springs, wagon front swaybar.