Air Suspension Compressor for Mercedes-Benz M-Class W166 GL-Class 2011-2019 OE 1663200104This is the Mercedes-Benz air suspension compressor (compressor, compressed air system) for the M-Class (W166, 2011–2015), GLE (2015–2018), GL-Class (X166, 2012–2015) and GLS (2015–2019) — the AIRMATIC air ride compressor that keeps the air springs pressurised. Four body styles, one platform, one unit.OE 1663200104 (also 166 320 01 04 / A1663200104) is supplied in a relay-integrated