I have the rear B6s in the lowest position on the spring plate, and the shock is still too streched. I think the problem is that the B6 for Civic MB6 are the same as those for Civic EK4. When I bought these shock absorbers, I saw that the reference is the same, and on the box it says EK4. Even if the shock absorbers are identical, the EK4 has lower springs and different than the Civic MB have. Even the B6's spring plate is too small for the original springs of my car, which forced me to have new spring plates made, just for safety.
I'm going to try installing EK4 springs. I already bought them and they fit perfectly on the original spring plate. Just need to assemble.
I don't buy lowering springs, because in Portugal, some modifications are illegal (the rules are too stupid), and my MB2 is a daily car. I just want it to drive a little sportier with less bodyroll. If the ek4 springs don't work, I'll try the Eibach springs.
I'm a little disappointed with the Bilstein B6 because of these issues. At the front they were perfect with the original springs, however I had to take the brake line bracket off the original shocks and weld it onto an iron tube that comes with the Bilsteins. But after searching on the online store, I found that the Bilstein B8 for EG6 have the brake line bracket welded onto the shock absorbers. I think the EG6 shocks are more straightforward to install on the front MB.
I leave some reference images.
BIlstein B8 EG6
Bilstein B6 MB6/EK4