Go here:
http://www.restorick.com/categories.aspand search for door hinge rebuild kit. Costs $44, and it's the correct way to rebuild your hinges. The kit includes S springs. Other kits that provide additional bushings that require drilling and modifying the hinge are not good, not long lasting.
Then call or email Rick and ask him if he can supply detent rollers from his junk pile to go with the kit. Maybe he'll make you a deal.
Looks like the roller shaft is swaged on the back side, if yours is like a '69 A body. Maybe you can press it out?
You might need to drill a center hole in the back side of the shaft so that the upset material that was swaged at the factory has a place to retreat when pressing it out.
