Arrived, as new, thanks. They will be going into some Z2 Light forks from 1998, with Motul 7.5w oil. I looked into the Marzocchi tech docs for fork setup, and they specify no detergents, and fully synthetic, which rules out lots of fork oil. Found the wiki by Peter Verdone with fork oil CST scores very handy: https://www.peterverdone.com/wiki/index.php?title=Suspension_Fluid
