I am not sure if this has been posted, but these guys offer 4 hole Discs for Cannondale, Formula, Rohloff, and Hadley:

Willkommen im WebShop der BrakeSTUFF Company - Braking with Style! - BrakeSTUFF Webshop

Thought this may be of interest to some of you that are needing new discs for your older hubs. They also offer mounting plates to space, even out and center the disc to the hub.