Air Suspension Compressor for Mercedes-Benz M-Class W164 / GL-Class 2005-2012 OE 1643201204This is the Mercedes-Benz air suspension compressor (compressor, compressed air system) for the M-Class (W164, 2005–2011) and GL-Class (X164, 2006–2012) — the AIRMATIC air ride compressor that keeps the air springs pressurised. One part covers both lines of this SUV platform.OE 1643201204 (also 164 320 12 04 / A1643201204) sits in a 21-number OE family, so one SKU backs every genuine