text: Several body parts of the G.T. were made of fiberglass including the front-end, hood, rear tail light panel, deck lid, quarter panel extension, and side scoops.
  1968 GT500KR
  Beginning in April 1968, Ford began factory installing a version of the 428 engine known as the Cobra Jet. This new engine featured a unique, 16-bolt exhaust flange. The GT500 was subsequently known as The Cobra GT500 KR. The initials KR stood for "King of the Road." Ford rated the Cobra jet at , but with  of torque at 3,400 rpm, although the horsepower was considered significantly underreported. Shelby's KR engine was left stock adding die-cast aluminum valve covers with "Cobra Lemans" to note Ford's FE engine family victory over Ferrari at Le Mans in 1966 and 1967.
  1969–1970 GT350 / GT500
  The GTs lost their Cobra tag for 1969, and once again were marketed simply as the Shelby GT350 and Shelby GT500. The GT350 and GT500 for the 1969 model year received an extensive face lift, the body alone increasing in length by  with some reaching . Ford was involved with design and style decisions, with Shelby having little input. The GT350 was now equipped with a 351 cubic-inch V8. Carroll Shelby terminated his agreement with Ford in the summer of 1969.