'98 ML 320

I need to change my rear shocks on this vehicle. It seems that the only shocks that fit this vehicle are the ones with the spring included. ( statement
based on the VIN & MBZ parts man )

Is that fact or can I change 1) the shocks only, 2) is there a non-dealer
option, 3) am I stuck with the dealer option.

I note threads here where many do seem to just change the shocks, not the
complete spring assembly.

I did change the front shocks about 1 year ago. Rears have pretty much now
worn out it seems.

Any info appreciated.