The Phase III GT Corvette branding was used only on approximately 12 1969-1971 Corvettes that were ordered as new car deliveries from Baldwin Chevrolet and converted by Motion. They are the only Baldwin-Motion Phase III Corvettes. There really is no such thing as a mid-series Phase III GT Corvette. Customizing parts were sold by Motion and there may be some Phase III GT references, but all true Phase III GT Corvette parts were made to fit only C3 model Corvettes. My Motion book documents the Phase III GT Corvette.
http://www.amazon.com/Motion-Perform.../dp/0760335389