reverse high

Hello everybody! Yesterday when i started up my 1966 ford fairlane the reverse wouldn't work after moving 15 feet it just stopped while doing a Y turn. I decided to trouble shoot, The trans fluid was good, the linkages were all nice and hooked up good and the car worked in all three forward...

I'm currently in the middle of rebuilding my 67' C4. While cleaning the reverse-high clutch drum I noticed the bushing is worn and cracked slightly and needs replaced. The problem however, is I cannot for the life of me find one! I know its part number C4AZ-7D046-A but even with that I cannot...