Are those the bfg at's??
My friend had a set of 315/70/17 bfg at's and they were the same height as my 33x12.5x17 PJ dirt grips. The bfg's are known to run on the "small" side. Doing the straight up conversion: 315/70/17 = 34.3x12.4 (so more like a 34x12.5)
Regardless, the XK is looking good!!!