On mine when I installed the 26” radiator I drilled the 4 mounting holes in the radiator support where they would have been for a 26” factory radiator, then drilled the holes in the mounting flanges for the radiator. The champion’s don’t have the mounting holes drilled in the right spot for the factory mounts (or at least mine didn’t), but drilling the extra holes was no big deal and there was plenty of room on the flange.
