After some years trying to find Noel McGlothlin I found a thread where he had shared cars with Robert Rentzell of Chatanooga in the 1960s. (Noel took delivery of BT21C-14 which is a strong possiblity of being my car)
A white pages search found Robert and I rang & spoke with him for quite a while. Yes Noel did own a BT21C and Robert drove it a couple of times when they were testing together.
He remembers it was scarlet in colour, not red but deeper, Robert said a definite scarlet. He wasn't sure what happened to it after Noel finished with it, and is going to ask the family for me. Noel passed away in 1980.
If I can find out what happened to it after Noel, then maybe I can link it to where I am at now going back ...
Here is a photo of AM288 at Mallala, South Australia at Easter in the last race where it managed a 1st place.
Ed