Can anyone tell me where to get a synchro kit to rebuild a 1993 240 M47 transmission?

 

When I had my m47 apart 5 years ago to replace the input shaft,I also need 3rd gear syncro. The guys at Volu parts told me there were no new parts available,so they sold me a used input shaft, and syncro blocking ring.When I put it together,the used ring wasn't much better than the original. I'd be interested to see if anybody knows of a source.