I agree, Bilstein will help you.
When I was in Australia in 1998 for the 50th anniversary celebration of Porsche, I went to a authorized Bilstein rebuilder and marveled at how they could build any shock for any application, as well as the sophisticated valving and how they gas charged the newly completed shock. He had ALL of the parts to completely recondition as well as build a new shock.
Hence I know that Bilstein will help you in this case
QUOTE(mepstein @ Nov 28 2018, 05:24 AM)
QUOTE(Chi-town @ Nov 28 2018, 01:59 AM)
Usually with Bilstein the sleeve is vulcanized into the bushing and isn't supposed to be separated.
you can probable send it to Billstein or a rebuilder but I e never seen that part sold separately.