Yep, that was me with the sway bar PDF. I listed the current replacement part numbers, not necessarily what came from the factory (way too much to try to list in one easy sheet). I believe the earlier wagons MAY have had a smaller bar, something in between the stock sedan and the later Sportline bar. That's why I put all the dimensions of the bars on the PDF. Measure what you have now with an accurate caliper and compare to the Sportline bar. If the difference is small, or the same, you could go with the "Limo" bar which will definitely be larger.
http://www.meimann.com/docs/mercedes/124_swaybars.pdf
Using a larger rear bar with the self leveling is no big deal, same with lowering. You may need to tweak the self-leveling lever arm to "re-set" the system so it works properly after lowering. To lower it, either use 500E rear springs, or dig up a pair or E420 Sportline rears for self leveling. There's a fellow on the board right now who's selling a new pair, he got the wrong springs (he needs NON-self leveling).
Bluestripe, it's basically impossible to remove the self-leveling system and have the car ride properly. Every attempt I've heard of had very poor results. Bottom line is there is NO advantage to removing it, you can lower the car with self leveling intact.
BTW - the rear sway bar install can take 4-5 hours if you have never done it before. An experienced tech can do it in less than an hour but don't expect to duplicate that! Here's the procedure for the sedan without self-level, with some shortcut tips (from me) added:
http://www.meimann.com/docs/mercedes/Rear_sway_bar_install.pdf
HTH,