I need to replace my center support bearing on my '92 F-350 (info in sig), which one do I need. There is two inner diameter sizes. Truck is a daily driver and hard to take driveshaft out to go part hunting. Any help would be aprrecitaed. Thanks Guys. See pic

 

didn't realize first pic was cut off

 

Your best bet would be to crawl under the truck and measure the outside of the shaft part where it goes through that bearing. If you don't have the proper tool to measure it close enough, the parts place can probably provide you with one.