I am trying to find a set of nylock nuts for Bilstein HD's but do not know the size. Anyone can help?

Also, has anyone successfully dealt with Bilstein office in San Diego? Is there anyone in particular I should try to contact at Bilstein? I was hoping to get the shocks rebuild, but apparently they do not supply spares and do not want to service (rebuild) old HD's that appear to be BMW OE shocks. At least that is what I was told. I was basically told to go away and buy new shocks (that are not available) and/or use 3rd party services for rebuild/parts.

Thank you,
Max