There were only 619 XR7-Gs built. They were built along side the Shelby Mustang, and were available with every engine and transmission offered in 1968, (except the 427). This was the first Cougar to be a part of the Hertz Rent a Racer program. If you have any information about these rare cats, this is the place to share. The XR7-G registry is maintained by Royce Peterson.