In the Prototype class, Porsche had three works 908s, also in "langheck" form, including regular team drivers Gerhard Mitter / Udo Schütz. This season's version was at least 20% lighter than the 1968 car. The new 908/2 spyder version that had been very successful through the season was run by the team's lead drivers, Jo Siffert and Brian Redman, through Siffert's sponsor, Hart Ski with strong works support. There were also a pair of privateer 910s in the 2-litre Prototype class.