If you're upgrading from the rounded stem 164365-000 to the beveled stem 164447-000 then you'll need to upgrade your valve body to 131183-000 at the same time. 164365-000 rounded valve stem and 130816-000 valve body work together. 164447-000 beveled stem and 131183-000 valve body work together. You can not mix the parts of these sets up but the sets are interchangeable.