this is the Sachs numbers for the Z3 Sport (EU)
Front, rear and their bump stops.
you can cross reference them to Boge who also produced a sport suspension setup for the Z3.
I could give you the numbers but I am not at home and will not be for another week so at my age doing this at a tiny mobile phone screen equals to eye torture.
The next best option is Monroe.
or you can just throw a set of Bilsteins and then you will be able to tell head from tales if you run over a penny.
cheers.
*edit - you posted while I was typing, already answered. Disregard my post.