Mustangs in Custom Car Caravan.'64 or '65?

[Historybuff]

I somehow thought the Alexander Bros. made a custom Mustang for a custom car caravan sponsored by Ford But in this story from a German website (fortunately in English)

Ford Custom Car Caravan

doesn't mention their name.But I wonder if the custom
Mustangs here influenced the Shelby GT350 or did the GT350 predate them?
I would like to trade pics if anyone shot any of these cars (even the Holman & Moody Falcon Challenger) but mostly I need the Pegasus or the two seat Mustang 2-seater coupe designed by Vince Gardner which might have been in the display.

I believe Lee Holman restored one of the Challengers and took it to England
recently for a vintage race. I think this car would have been in production if it had won when run at the Sebring 12 hour race in 1962. The car was built in three weeks and driven by Marvin Panch and Jocko Maggiacomo. Finished 2nd in class and 36th overall. In your wildest dreams, could you ever imagine a Falcon leading a Ferrari GTO at Sebring? One website says it was proposed for entry in the 1962 Le Mans 24 hours but the entry was not accepted. If it had been,history might have been different...see the fastback Challenger
at this website ReferenceFord