Let's see....I think that's the first thing I installed. I did use their lower mount. I managed to just use a thin piece of foam for the radiator to sit on....then just drilled a small hole and "washered it"
....it all fit fine. I can go get some pictures for you if you think it would help.
I think I put the radiator on the outside first....so you know where to drill the hole....know what I mean? The little radiator flange lips should go between the lips on the radiator support....but to get the holes right, I sat the radiator so that the radiator lip sat on the outside....that way I would have a good way of drilling the hole and getting the position right. I think I just used a drill the size of the radiator holes....it all worked fine. If none of that made sense, just yell.