The Italian firm Ariete produce rubber parts for many modern Italian motorcycles. In typically Italian fashion they never threw away the moulds for the OE parts they made in the 1950s. Every so often they make a batch when demanded & you get a truly original new part for your bike. Not cheap, as these are individually hand made, but truly “Original Equipment”
Unfortunately I am now out of stock of all Ariete products. The minimum order to replace the hi-cam parts is rather too large for me to contemplate restocking. You will find Ariete stockists in most countries worldwide and they should be able to order whatever you need from the catalogue as part of a larger order. In the UK Carrot Cycles & North Leicester Motorcycles may be able to help.