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Hi Pete
I would have thought that your local dealer would keep them in stock.
I lost a couple of mine went to my dealer and they had them in stock.
P.S. They were that kind that they gave them to me FOC.
My dealer replaces mine at service times and don’t charge. As I loose to many he has suggested I use Bluetac in the bottom of the cap. It seems to work have not lost one for sometime now.
went to my dealer and they had them in stock. 
