tapered roller bearing where not stock fitmend . what size are the bearing your after ?
basicly there are 2 bearings that would fit the 26 mm stem Ducati used . a bearing with 52 mm O.D
and a bearing with a 47 mm O.D. what size are you after ?
Regards Eldert
Check Syd's cycles in St. Petersburg, FL (727-522-3333) - they sold tapered headstock conversion kits for decades and you need to go back to them for replacements - good chance thats where they came from when the last guy upgraded those....I'm not sure what size I need. I did find this site Bearings ducati 450. But they don't sell them anymore.