That is the front axle pressure accumulator. No idea where it goes I only have rear axle air. Use realoem.com to track down all the parts and see if you have everything. I'd expect your air pump to still be under the spare above the battery but the accumulator may have been in the way of the springs.
Upgrade to premium member I'm betting you can resell the spring conversion if you get your air working.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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