For one of them bevel bikes (they don't have belts apparently 
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Ducati Bevel Marzocchi Top Yoke | eBay
This is a 38mm NOS 'flat' top fork yoke for Marzocchi forks as fitted to Ducati bevel twins. As can be seen from the pictures this is from another application so it has handlebar clamps and also extra mounting lugs that will need to be ground off if original appearance is required. The yoke will...
www.ebay.co.uk