The 1971 X is 440-6 Auto 410 Dana Air Grabber PS PB Rallye Wheels, I believe it is Gold Leaf ext. and Beige Int. He added a Wing and factory louvers and tint in the 70s. I will look up your email and have him send some information on the car.
I saw this car at Carlisle back in the mid 2000s. At that time it belonged to the 2nd owner Philip. I assume ownership is still the same?
So to confirm, the latest SPD I have for 71 GTXs is 709. Same for 71 runners. I do have many GTX vins with higher numbers than his, mostly U code cars, but one V code also.