Hey Jughead...Does this help you out?
http://www.sohc4.us/forums/index.php?topic=5336.msg42717 Seems like I posted the entire thread rather than the post I wanted. Here's the info I was directing you to.
If anyone's interested the Honda part number for the '77-'78 750K/F carburetor "Gasket Set" is 16010-405-004. Good for one carb and includes...
1-carburetor cap gasket
1-pilot screw o-ring
1-accelerator pump o-ring
1-float bowl gasket
2-fuel tube o-rings
1-float bowl drain screw o-ring
If you do all four carbs there will be 3 accelerator pump o-rings and 2 fuel tube o-rings left over. I bought these a couple of years ago at the local stealership and paid around $23 each. I no longer do business with them but that's a different story. I'd look for them somewhere like servicehonda if I was buying again.
Mike