[s-cars] door lock actuator part #??

[matt ludwig]

hello all,

I appeal to my higher power (the S-Car List) for some wisdom and 
reference. The pneumatic "actuator" for the tailgate of my S6 Avant has 
worn out and the door lock will not open/close. Now, the actuator 
itself still works, it is just the rubber boot "sealing" the piston 
that opens/closes the lock is torn or leaking in any case. I am looking 
for:

1- part number for the entire black actuator
2- if the rubber boot can be replaced independently of the entire unit
3- the part numbers for both :)

thank you, thank you to whoever can assist here....

sincerely,

matt ludwig.
1995.5 s6 avant
washington, dc