BMW Drive Belt Idler Pulley for M57N & M57N2 5' Series - INA 11287802146Part number 11287802146 5' E60 (02 2002 02 2007) 5' E60 LCI (10 2005 12 2009) 5' E61 (11 2002 02 2007) 5' E61 LCI (11 2005 05 2010) 6' E63 LCI (05 2006 07 2010) 6' E64 LCI (04 2006 07 2010) *NOTE: This product is an OE BMW Product, without the BMW logo, with a considerably cheaper price tag. Referred to as a deflection pulley, 85mm diameter Your BMW's idler pulley is tucked in the front of the engine accessory rack. Most often this part is overlooked