I don't think the 1969 Orange one at CT auction is a Phase III GT but is a Phase III.
In my opinion a Phase III GT needs to have both the Ferrari nose and rear window modificaton.
If you are counting all Motion modified Corvettes there is a bunch that have been found over the years.
I have about 20 Corvettes in my Motion notes.
some Phase III GTs, some Phase IIIs, some are just Corvettes with a Motion hood, 2 are Motion IMSA wide bodies.
Some built new by Motion, some shop built on used cars, some documented, some not, etc.
Each car has it’s own story
This is not counting the Motion Maco Sharks. There is maybe 20 Maco type Corvettes on
http://www.makoshark2.com/index.php
I think only one is documented as MP built.
Some were Motion kits others may be from Silva