Hi, mine are of the first production line. Avon has sold all! The onliest company which has some on stock of the 275/55-15 and 295/50-15 is in UK :
http://www.bmtr.co.uk . I cant tell you something on the tires, exept the GT40 racers in Le Mans have them on their cars and loved these tires. Dry and wet good useful tires! I will have my testride anytime on the commig weekend !