[shores6]

As of right now, I don't think anyone makes a spacer for the boxed version. The carrier bearing they use is a 2500HD truck. You can get them at inland empire. As far as the driveline goes, any driveline shop will be able to make a two piece drive line for you and more than likely supply the carrier bearing and make a spacer. Be sure to measure your driveline at ride height, full dump, and full lift to make sure they don't build it too short. You'll be measuring from transmission yoke to center of carrier bearing holes and center of carrier bearing holes to flat surface on the rear differential yoke.