The XTC uses an integrated headset, which basically means the bearing cups are built in. Take a ruler and measure the inside diameter of the top of the headtube, I can't remember if it's 41.1mm or 42mm. You need an integrated tapered headset. I would recommend this
Tapered IS41|IS52/40 Short Top Cover (If it's 41.1mm)
Tapered IS42|IS52/40 Short Top Cover (If it's 42mm)
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