I too would like to know the difference between the 163320
2313 and 163320
2413 shocks. I have a chance to purchase "23" locally but I have early (1998 production date) ML430 and, according to dealer, it needs "24". I read at forums that some opening needs to be drilled out bigger in order for "23" to fit into early production ML. Can someone confirm that? Can someone confirm that "23" are newer and have updated valving thus making the ride softer? I think I read that info on Wolfgang's page but he didn't clarify newer shocks fitments into older MLs.

Please help!