Revell did the '70 GT and Cobra, AMT's '70 & '71 kits were Cobras (note that besides the Motor City Stocker kit, AMT also did full detail '70 & '71 Torino Cobras, they came w/ the Boss 429 engine). As far as I can tell from pics online, the '71 GT had two different grilles available--a split grille with exposed headlights, and a hidden headlight grille that looks like the '70 GT hidden headlight grille but w/ a vertical rectangular emblem in the center instead of the round emblem on the '70.