the car that you are looking for,i think,doesn`t exist.
Hertz Production by Year:
'66 GT350 Fastbacks: 999
'68 GT350 Fastbacks: 224
'68 GT500 Fastbacks: 2
'68 GT500KR Convertibles: 1
'69 GT350 SportsRoofs: 152
http://www.carrollshelby.com/history.html