To the best of my memory the Mustang 350H cars were only available with the four speed transmission,
Mr Horsepower, I believe your memory requires a slight calibration. The vast majority of Shelby GT-350H were built with the C4 automatic box. Of the 1000 GT-350H ordered by Hertz, 100 were to be fitted with the top loader 4-spd trans, but after the first 85 were delivered Hertz insisted that all remaining cars would be automatic.
Anorak Fact; In order to rent one of the 4-spd cars you had to qualify by demonstrating your ability to drive a manual shift trans. Once done, you recieved a Hertz Sports Car Club member card, and from then on all you had to do was produce your card to rent a manual shift car again.