carb o-ring

I got a pk19 carb from AGK. After about 2 weeks it started leaking from around the float bowl. So I pulled the float bowl to find the rubber O-ring had been stretched and now longer fit the groove that it is normally seated in. So, I shot off an email to AGK detailing my findings. They sent a...

Hello world, couple questions. #1 - Where can I buy metric couplers? Size M6 and M8 for the head studs? I tried ace hardware and home depot but they said they do not have metric. I checked ebay and im confused why this request seems so foreign. When I bought my high performance fred head type of...