I've got their mount kit but not the rad.....I am not far enuff along to even try to install the mounts. The directions talk about cutting out a section of the strut support bracket that runs from the frame to the rad support.
But, very similar to the Ford mounts where the Ford mount saddles the tank to core seam. Then a flange to bolt to the rad support. On top is a U shaped aluminum piece about 12-14" long to hold the top of the rad.
Yea, the instructions talk about cutting the rad support opening. I forget how much. I want to say equally on both sides and almost out to were the vents are on the passenger side and equal amount on the drivers side.