BMW e36 Alternator Cooling Air Duct Boot + Intake OEM airflow scoop hose Alternator Air Duct Cooling Duct/Boot + Intake scoop Brand NEW parts with full 1 year warranty. BMW part# 12 31 1 735 915, and # 12 31 1 730 635 Genuine BMW part, recently made: not been lying around. Please NOTE the mid-year split on PRODUCTION date. Not sure about your car? email us your VIN to confirm.