w/o Housing Aisin/ASCO made - This pump must be checked for impeller to housing clearance prior to instalation - There is a difference between the Aisan made vs. Aisin made. 16110-19175 = Aisan type 16110-19185 = Aisin type. These are NOT interchangeable. But if you use 16100-19305 (w/ housing) then you can use this for either 16110-19175 or -19185. w/o Housing - Pump must be inspected for impeller-to-housing clearance prior to installation - There is a difference between the Aisan made vs. Aisin made. 16110-19175 = Aisan type. 16110-19185 = Aisin type. These are NOT interchangeable. Pump w/ Housing (16100-19305) replaces both Aisan & Aisin type pumps.. w/o housing; see notes!