Did you guys try the eBay one?
BMW x5 E53 5 Series E39 Wabco Air Suspension Compressor Pump Repair Refurb Kit | eBay


Or should I stick with the ecs one?

Search SiteSearch Air Suspension Repair Kit - 100698010A - Air Suspension Pump Repair Kit - ES#289283

Mine doesn't have any problem yet but just to be prepared if the pump fails.

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4.8is 2004 imola red
4.8is 2005 Black on Black - DINAN/2 sold
4.4 2004 X5
2003 330xi
2008 328xi - sold
4.4 2000 X5 - sold