Being at home I am guessing, but that number would be rear suspension and I think that is the one that has its hole drilled offset so that a small toe correction can be made.
Is that what you want? The normal bushing is an 01 or 02 if I recall. Both should still be available. I might have a 07 in stock as we used to stock them. Did you ask the dealer to order it? They wouldn't stock it, they are not cost effective to replace.
Bosch Master, ASE Master, L1
33 years MB technician