Another update to close this out (with a follow up thread to warn people on these PTI driveshafts).
Replaced the CSB on the original driveshaft, greased the splines, and reinstalled it. No preload on the CSB since it was already naturally placed pretty far forward. No vibrations and smooth as glass. Cowbell noise gone.
Onto the Dorman (PTI) unit. U-Joint bolt had completely backed out. Not sure if this was due to the vibration, or the other way around. Also the CV Joint leaked leaving grease on the diff and on the threads of the new bolts. Probably due to it being overpacked. That was a fun hour and a half wasted cleaning everything. Maybe PTI was good at some point but their QC is practically non-existent based on my experience.
Replacing the original CSB was easier than I thought. Grabbed a 3 jaw puller set from Harbor Freight and It came right off. Pressing on the new one was easy with a large socket and a dead blow. Tapping it down one side at a time doesn't work. It needs equal pressure all around. Torquing the U-Joint bolt was interesting. Picked up
this tool on Amazon that came in handy. Originally planned to just go with guddentight but seeing the Dorman's bolt backed out I'm glad I had ordered the tool and torqued it to spec.
Sorry again OP for detailing the thread. To answer the original question, there is a top and bottom to the CSB and it's marked on the OEM one. And the side of the bearing that protrudes out faces towards the front of the car. All the best to whoever takes this on. But stick to OE and just replace the CSB and guibo and be done with it.