Just bought a 14x6 steel wheel today and by searching this section belive it to ba a 66SS wheel. It has 14x6JK stamped on inside of wheel underneath it is also a small 12 and a small 6. Also has the kelseyhayes made in USA logo on the inside . Had seen one post where a member had a wheel with the small 12 under the 14x6JK, but havent seen mention of the 6. It has GM with 65 under it on front of center section. By the valve stem is just a 6 nothing else. The measurement from back side of center section to edge of wheel is approx. 4.5"