Rear coil spring replacement needed on 82 300TD?

[nicholas]

So I've tried all kinds of ways to get my wagon's SLS system bled after restoring the system on my wagon. I have finally gotten the rear end to raise up now and sit at the correct level.

However, the driver's side rear is consistently 1/2" below the passenger rear side (measuring from the mercedes star on the wheel to the fender lip).
I'm not sure why this is, but I think it might be time for new springs.

When I bought the car, the SLS system was disconnected and rode only on the original springs with a pair of standard shocks retrofitted in. The springs had these metal slugs wedged in between the coils. There was also some improvised spacers made out of a single coil section, cut apparently from another spring, which sat on the lower spring perch directly below each spring. This was all done apparently to increase the ride height to make up for the removed SLS system.

Given the above conditions, can I assume that the reason for the unequal heights between the left and rights sides of the car's rear is because the springs are just worn out?

The other part of this is I've found a few parts sites that apparently list the wrong springs as a replacement for these. The correct Mercedes part # for a 1982 300TD is 123 324 06 04. However, on a few sites, including pelicanparts, the Lesjofors part number comes up as 42 568 02, which according to Lesjofor's catalogue is the part # for for the 300D.
Is the cross-referencing simply wrong?

The 300D rear spring generally costs less than the Lesjofor's recommended option for the 300TD - can I just use a 300D rear spring in a wagon?

Here's the spring info acc. to Lesjofors catalog:

# 42 568 02 (recommendation for 300D)
Wire Dia. - 16.00 mm
Free length - 360 mm

# 42 568 05 (standard duty recommendation for 300TD)
Mercedes
Wire Dia. - 15.50 mm
Free length - 357 mm

# 42 568 30 (heavy duty recommendation for 300TD)
Wire Dia. - 16.00 mm
Free length - 343 mm

Thanks for any insights.