I sometimes get confused too, but always remember Zetec DOHC or SOHC are belts along with the SVT Zetec, but the SVT Zetec is a interference motor, unlike the normal Zetec which is non interference.
And as far as the SPI goes, I believe that is a belt too, but non interference. And you already know both Duratec's are chains and are interference motors.
A timing kit from RockAuto I believe is around $125, and that has the Gates name on it. As far as timing pin and bar? You can make one with the measurements from a Haynes manual, or MassiveSpeedSystems.com
sells a kit that has the bar and pin for $35.