3spd transmission "bullet" seals

[oldblue1968chevy]

Hey folks. I've got a 1968 3spd manual transmission that's leaking oil from the speedo cable. I've been told it's the seals on the bullet.

I've removed the bullet it has an oring and a funny seal on the end that is apparently missing. I've called every autopsies store around and done a thorough search online. Some info for th350/th400 etc Trans but no love for the manuals.

Like I said I'm in need of seals or a new bullet for a 3spd manual transmission. Also, what should I be inspecting on the plastick speedometer gear?

Thanks
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