That sounds more like a Greenfield system: two disk clutches, going in opposite directions, one each for forward and reverse. If they are flat disks that squeeze together flat side to flat side, like an automotive clutch, it is quite different. There has been discussion on this site before about relining flat plate clutches for Greenfield ride-ons. The usual method so far has been to get the rings of brake lining material from wherever you can (probably a brake shop, but you could decide to remove the linings from an unwanted automotive clutch plate of suitable diameter), and glue them to the flat clutch plate with contact cement. You can even see posted pictures of how a member went about that job, if you search Greenfield threads here on Outdoorking. It was only a few months ago.
