I got mine from getbmwparts.com as an additional part of an oil change kit that I ordered for my 328xi.
You can probably get them cheaper but I include my VIN with the order and Tischer has always been spot on.
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2007 E90 328xi l 6MT l Sparkling Graphite Metallic l ZSP l ZPP l ZCW l iDrive l Logic 7 l Mapleridge Headers l 3 Stage Intake Manifold l AA tune l BMW Performance Intake l Euphoria 6K LED interior l Blacklines l V3 Mtec l VMR VB3
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