[A-Snake]

Other than the very early 30xx cars the fans were installed by AC Cars. Most if not all comp cars did not run any fans.
Having dual fans would have involved a change and an extra charge at Shelby American.
The mounting bar would have to change and not sure if two stock diameter fans would fit side by side.

Unless the change is noted on the invoice, I would be skeptical of any claims that a car came with twin fans.