I imagine you have 4.8is since you're mentioning front and rear air bags.
If I'm wrong and you have rear air bags only (3.0, 4.4., or 4.6is) I have air compressor in good condition that I just removed since I switched to rear coil setup.
If that's your culprit and my part fits, I'd let you have it for fair price.
PM me if interested.

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2010 BMW M6 * Black Saphire Metallic * Full Black Merino Leather
2019 BMW X3 M40i * Alpine White * Mocha Leather