DennyRR

I purchased a 1974 440 GTX Roadrunner 3 years ago. I found information that there were only 386 440 GTX made. When I purchased it the owner said that the interior was rare also. He said only 79 of the 386 RR 440 GTX were made with this plaid cloth seat with vynal trim in 1974. It was called Wimbleton plaid. Where can I confim that the 79 number is correct.? DennyRR