can't account for 1972 but here's what I've got for 1971:
Y91 69-71 Show Car finish A/Less gas
Y92 69-70 Show Car Finish B/Less gas
Y93 71 Show car Finish B/ less gas
Y97 70 Show car Finish 3 gallons gas
That's all i got and I can't explain that.
I think they may be sales codes charged to the customer. Show Car finish A or B as per listed price on a pricing schedule somewhere less the gas which is charged as extra and delivered to or picked up the customer with a full tank. Code Y97 no designation for the finish as it was the same treatment for the entire year only they charged for 3 gallons minimum of gas delivered to or picked up by the customer.
