Radient Red is the rarest mate with only a handful made...
Closely followed by Black, they made a few dozen of them.

All other colours are pretty common on the grand scheme of things
I wish someone who works/worked for Ford could confirm exactly how many were made though.
Here's the best links that I found when I searched these forums mate.

https://passionford.com/forum/viewtopic.php?t=88071

https://passionford.com/forum/viewtopic.php?t=150495

https://passionford.com/forum/viewtopic.php?t=129238