Took an hour to pop out the springs...not hard at all. I used the Wiki article whunter forwarded me to.

Well heres the pics (2nd post):

W123 rear spring experts...need some help...

Now to figure out if they are the right ones. They have the same number of turns as the pics on worldpac. The spring pads were 9.5mm, mercedes OE parts.

Now to figure what else to replace in the area while the patient is open. Subframe bushings for sure - theyre original.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car