Mike, when i had my JRC on there, I had the exact same one as you, and didn't have to change anything, but drilled a couple of long bolts down thru the support to hang the IC on. I sold the JRC and picked up a Precision 350hp IC, which I hear is actually good for plenty more than that, but it's a much thicker core and a little bit shorter, maybe 3" overall, but never had them both to compare... anyway, I'm a big fan of the precision coolers due to the high density of fins. I've never seen an ebay cooler to compare, but I know that the JRC had waaaaay less fin density, which essentially means less cooling ability.