Originally Posted by Rudz
I don't know what they're specifically called, I just know they're m8 1.25 nuts
Here ya go
$10 shipped to your door for a full set.
If your have a GT5 engine like a Grube like Gasbike.net sells, Kingmotorbikes or Piston bikes these may not be the correct thread, but if you have a PK-80 type engine these should fix you right up.
I'm assuming you are looking for this tall of a nut like is used on some of the aftermarket heads.
Yes Fred is a choice and also this seller has them.