Hmmm....... I think i may have opened a can of worms here !
My car still has the original trunk lid, and the go wing was fitted in the 70's, the type that
is fitted to mine was also fitted to some Ford Mustangs in those days. (I have seen them)
So, was there more than one type of go wing produced,as the one on that orange cuda
photo is definitely different to mine ! Maybe we should have a survey to see who's got which type fitted and what year car.