I purchased raw shafts, nocks and inserts then assembled, that way I got the components I wanted.
I don't do verticals any more but it seems to me that the carbon bolts I buy have larger diameter and thicker walls than vertical bow arrows. I'm guessing that the pull weight of your x bow may be a factor. If it's relatively light, then perhaps thick walled carbon arrows will do. Personally, I'm not about to take tht chance when using a 200 lb pull weight x bow. The picture of a splintered arrow protruding from someones hand/wrist prevents me from taking such chances.
There's a lot of folks that will help you here no doubt. Just keep asking what you want to know. Also check out the post about "rolling your own" below.