The winged V8 center caps are made of aluminum not the black plastic 3M stick on sold from SFR; they will fly off when you hit a bump/pothole especially if the cap has a film on it when applying it then combin it with brake heat (brake dust plays hell on the wheels). Basically the factory does not have enough requirements to make a line of wing V8 caps, so the
aftermarket does and that's why they are expensive. If you screw up and scratch a V-8 cap modifying it with the 17" plastic set, your out $80 for a new replacement cap and a 17" center unit, unless you like scatches or gouges. The ones I do for some people does sound odd, because I ask you to mail your caps to me and I take them to the plant here in Korea (I'm stationed here in the military). A Korean friend that operates the machines there replaces them with winged aluminum ones. I pay for the parts, labor, shipping, and charge only $125 or $135 with a hood & trunk wingset. I only ask that you send me your caps and I return yours completed. I've done this for other members.