I just thought I'd mention this for anyone who does their own tune-ups and such. Yesterday I tuned up my 1991 Ford F-150, 5.0. The usual. New plugs, (Bosch Platinum +4), new Bosch wires, rotor and cap. Fuel and air filter, the whole bit. The salesman over at Auto Zone told me to bring the old plug wires in, and I was eligible for a refund! I couldn't believe it. The last time I replaced my plug wires was 7/2001. Sure enough, afterward I put the old ones in the box, took them back with my receipt, and got $44.60 back! For anyone buying new plug wires, it doesn't get any better than that! Bill T.