Development Blog, Grand Prix 1973 Grand Prix 1973 Mod Development: Surtees TS9B Showroom Preview Posted on January 30, 2022 by admin 30 Jan Final car of the 1973 Mod is now finished. All cars are in the game now. Helmets skins, physics tweaks and in-game adjustments will follow next. All images are Work-in-Progress. Grand Prix 1973 Mod Development: Tecno PA123-6 Showroom Grand Prix 1973 Mod Development: Helmets are ready!