Recently had a friend who serviced my forks and he found the rubber piece at the top of both the forks to be broken. Got the yamaha part number and went to the yamaha parts dealer but they dont order this part in! Now i have to source for this part so i need to know if there is another name for this part besides 'rubber' as printed on the yamaha parts list. Would like to know its purpose for being in the fork because my friend claims it can run without it but i dont want to take any chances. Anyway the part from the parts list is number 15 from the image below.