Back then the orders for any car was done by mail. If the order went through the dealer would get an acknowledgment notice back from Chevrolet and the car would be built. If not it would come back incompatible and the order would be canceled. There was no other reason giving. I wonder if the window sticker was a dealer made sticker? We were giving blank window stickers from GM and would retype them when options were added. My friend Ed has some of then,he can be contacted at
[email protected]