If you decide to change from a regular hose end fitting to an AN fitting on your upper coolant housing w/ filler neck or vice versa this is the part you need.

Hose End PN - KUW-LHF

-12 PN - KUW-L12

-16 PN - KUW-L16

NOTE: This part number comes with only the fitting. ie. no filler neck, rad cap or base plate