Studiog,
All of the supports used the same mounting on the support, and all brass radiators were exactly the same, so I am sure that changing to the 59 style shroud will not solve the problem. It is just harder to install and remove due to the different configuration on the lower section. Slip the top shroud back on and take a pic where the problem is and post it. I just hate to see you chase your tail only to end up back at the same point you started. You may have a non-original style radiator, but then neither shroud would fit.
Regards, John McGraw