Let me start by saying the reason I removed the system was twofold. When I first bought the 83 TD the reservoir was empty of fluid and the area aroung the right rear strut was wet. Also the engine I got from a yard to replace the blown diesel was from a sedan so no provision for the pump.
Here is how I converted.
I ordered 2 Bilstein shocks for the rear that are for a sedan .Part # B46-713 They installed perfectly. In the car where the shock tip protruded above the nut I cut that flush. That way the rear dress cover can be reinstalled.
Now when I lowered the car back down (I have a lift). The vehicle only sat slightly lower in the rear. When I measured the height I used the molding that runs down the length of the car as a guide. I feel that strip should be parrallel to the ground. In the front I had 29", in the rear 28 1/2 ".The coils where holding the car nicely
Next I bought some large coil spring spacers. To install I used a standard spring compressor that is used for Mc Pherson struts (Cheap like $18 for the pair). I compressed the coil enough to insert the spacer. I put the spacers between the lowest 2 coil rings. That way the spring can still compress nicely and smooth.
When I lowered the car down It was now 2" higher. The vehicle sits perfect with only a slight rake up.
The test drive was great. The car handled perfectly ( I also put 2 new Bilsteins up front). It went over bumps smoothly and quietly.
Time will tell if the rubber spacers will last. I will keep my eyes open for a stiffer pair of springs. Also don't limit yourself to Mercedes coils. You might find that a pair from a buick might fit the bill. Length and spring diameter are the guidelines. Coil diameter is where you can play around.
So yes it can now be told that there is a succesful conversion from SLS to standard shock and coil. HTH MIke

PS Thankyou to all who answer my requests for info on this forum. You guys are the best!