i'm sorry to say that i think they only raced sedans in production touring before 1973.all the bathurst videos show 4 doors,including the infamous bursting windscreen shoot as the big'un rolls a factory sedan at forrest's elbow.the coupe raced by the factory after the introduction of group c rules in 1973 was a factory race series special,with little known modifications like 4 inches wider body work across the rear wheel arches.i know this as i know who has that car,& when they tried to put a 1200 coupe rear seat in it,it missed by 2 inches each side.the owners did have plans to convert it back from club car 2e to group c,but knowing Frog & Mick,it's probably in their dad's garage gathering dust.sorry if this doesn't help you,but if you need to know the names,email me at rob1@tech2u.com privately,& i'll let you know,they might even try to sell you the thing.ps if you need a genuine option 1 close ratio 1:1 5 speed,i know who's got one of these little beasts,i sold it to him not long ago.