OEM o rings are pricey($20 and up), so I ordered some from a local seal supplier, but they had a minimum order requirements. Have a few sets left over and hope they can help others out at an affordable price. $5.50 shipped for both sets(6 o-rings total). One set is silicone and the second is nitrile rubber. As shown below, I've been using them for couple years and the fit is excellent.

All gone,
Will post again if I find any more during spring clean up of the work shop.