Mercedes W-163 (late) Heater Line from Aux Pump to Expantion Tank Heater Hose From Auxiliary Pump to Expansion Tank NOTE: fits from vin's ENDING in 'A145273' or 'X707756' OWNARD. Please see FITMENT CHART below, under PRODUCT DESCRIPTION. Mercedes part# 163 501 35 82, note the vin splits. Recently made by CRP INDUSTRIES, not been lying around.