I saw the confusion over BT23C-17 in my research, but don't think it matters in long run as the NZ car was destroyed in a fire in 1978.
So important thing is there are not two of BT23C - 17 running around to confuse the market.
Interesting thing about the fire is I have seen it described both as in a garage, and in a nightclub.
What it was doing in a nightclub is anyone's guess........