Update: I got a hold of him and I did purchase a rebuild kit it was $39 GBP which equals $61.10 He has sold over 650 of these and I have read a bunch of reviews from the land rover forums and it works great in there wabco air suspension system. So, I will let you guys know as soon as I get it. Ill snap a few pictures of the parts.

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2004 X5 4.8is Build date 6/04 VIN:LE81418 (Black on Black)
2000 E46 323ci (Black on Black)