EK-480 block on GTX580?

I just got my 480 not too long ago, within 90 days, so yay for evga step up program. I look at the PCB photos, it seems like it might fit, except where the opening in the back, the 580 doesn't have them, but it does have holes for screws.

So what do you guys think? Would it fit?

GTX480:


GTX580: