Hello I will answer your question,
Is this a 2006 or 2005?
Have you been able to source a center bearing separately?
All my information shows the entire prop shaft being replaced as an assembly and the center bearing is not available by itself.
In the past I have used a driveline shop to match the bearings and joints that I required but were not available through traditional sources.
Below are the instuctions for the center support bearing on the rear propeller shaft. A press will be needed. I recommend removing the shaft and carring to a driveline shop or machine shop if you don't have the press available to you.
Notice: Never clamp propeller shaft tubing in a vise. Clamping propeller shaft tubing in a vise could dent or deform the tube, causing an imbalance or unsafe condition. Always clamp on one end of the yokes and support the shaft horizontally.
Important: Prior to disassembly, mark the positions of the driveshaft components relative to the driveshaft tube. All components must be reassembled in the same relationship to maintain proper balance.
J 44870 Yoke Installer