The outer crank seals should still be available from Honda, I just bought a set from David Silver Spares here in the UK. if you're referring to the centre seal I know that a company called T2 in Japan have been making aftermarket ones but no idea if anyone's used them yet? I understand that the old centre seal can often be ok to re use but don't quote me on that. I'll have to pass on the second question and leave that to somebody who knows!