The larger deco trucks use a more friendly design for the dual master cylinder. Instead of having the MC cradle that bolts to both the bellhousing and the transmission, The larger deco trucks have a clevis rod that is "pulled" when the brake pedal is pushed. The clevis rod goes to a reversing arm that is mounted to the frame. A frame mounted MC is then mounted in front of the reversing arm. When the reversing rod is pulled forward, another rod pushes the MC.
With this setup, many universal frame mount MC kits can be used.
So look at the brake/clutch pedal setup from a 1 or 2 ton truck, and grab all the linkage rods and you will be set.
