Wanted: Cam Oil Seal 16X28X7

[sandmbik1414]

I was wondering if anyone has an extra cam oil seal ( I think it's a 16X28X7) that would fit the head of a 67 Cl77. I assume they are the same on all 305 heads. Anyhow, I have been having a lot of trouble finding one on the web. It seems that complete sets sold on ebay don't usually include this seal for some reason, and I would rather not buy an entire set when I only need one. I tried to find a bearing house in California where I live, but they now have all but disappeared due to lack demand. Any advice would be greatly appreciated.

Thanks
Adam