1924-1927 Model T Radiator "hi" style - alternative shell neck hole placement

We locate our neck using an original shell.  Since the mid seventies, we have built radiators this way.  Apparently, there exist radiator shells that have a neck hole further forward toward the bumper.  If you have one of these you should order a radiator with the neck placed in an alternative location.  Your shell may be aftermarket and some owners assure us they have an original shell - we do not have an opinion.  To measure; place a straight edge on the tank face and measure to the radius of the neck.  If it does not measure 9/16" provide your dimension when ordering.  All other dimensions remain the same.  It is called "hi style" or tall radiator because its core measures 18-3/8".  It is set-up for the OE engine in its production year. There are core options available based on usage and budget. The round tube is the OE design and cools better due to (1) being clean of scale sediment and oil, (2) tube wall thickness and copper not brass.  It is a more authentic looking radiator