w211, e55, airmatic, problem

[PETE'S COUPE]

Hi, Same problem car sagging over a couple of hours. On inspection found that the ally "expansion vessel" has corroded where the hose from the "bellows" connects.
Would anyone know where these can be obtained please.
Cheers!

 

[shorty]

I think these have to be bought along with the air spring , though im not 100 % sure .
The air spring cost about 600 euro

 

[Alps]

arnott industries in the US refurbs the units, drop them a line