Haywire,
What i've gathered from a fellow enthusiast is that, there are 3 types absorbers made for E39 (factory fitted originals):
1) Standard Abs
2) M Sport Abs
3) Mtech II Abs (M Sport II)
And the one you're referring to is (3). My question is what is the diff between M Sport & Msport II abs...well apart from their part numbers?
p.s: Did you find out from Bomin if they have the one you're looking for?