okay, it says same location and same plane and implies must block off any new opening;

3.0 Engine Cooling System
a. Any radiator may be used, provided it is mounted in the original
location, maintains the same plane as the original core and requires no body or structure modifications to install. No new openings created by fitting an alternate radiator may be used for the purpose of ducting air to the engine.
but it can be smaller right? and if it is smaller, that is not really the same location is it?

so original location means between the engine and the front bumper?
same plane means if it was vertical, i can't tilt the top forward?
and if smaller, i have to add blocking plates to prevent having a new opening, right?