OK, here's a picky question for 66 owners, particularly those with original closed letter valve covers, or you judges out there. I'm curious about the numbers on original PCV valve grommets for Cobra closed letter valve covers. The numbers on mine are: "378766 S" followed by "FK 89" and what looks like a "1" off by itself. I have no idea what these numbers mean or how variable they are on original grommets. Thanks, Dave McDonald 6S1757
