SDP-SI.com does have some in stock. Their part number is: A26R51M080060
They want about $5.00 for one…
Gates also offers it. you might check with your local industrial supply house. Gates does have stock (as of today) - the Gates # is 160-2MGT-06
My local Gates guy also wanted about $5.00 for it - he’d have to order it from the factory.
I am not affiliated with any of these companies, I am just offering info.