A couple of years ago, I modified my stock water pump so that AN fittings could be used and I ordered the Rad to match from C & R.  A good  feature of the rad is that the inlet and outlet fittings screw in so I can now convert from the #16 AN fittings to the standard Mazda hose size.    Question is, what is that hose size?  I don't have a stock rad or water pump to check.  Thanks,  Jerry