wraith ripper

Can somebody please advise me on what Air cooler will fit on my X399 Aorus Xtreme MB. I brought a CM Wraith Ripper for my Ryzen 2950x, but now I have found out the WR is so big that it blocks off the 1st PCIe slot where my GPU is supposed to go. Which means I have to move my GPU down to the 3rd...