I have examples dated as early as July of 1969(no part number on the super early ones, no part number on any super early Motor wheel rims, for that matter). Motor wheel made 14x5.0, 14x5.5 and 14x6.0 steel wheels all through the 1970 and 1971 model years, and also at least into 1972. I have many examples with part number and date codes. If they weren't used on B and E body cars, you tell me what they came on??!! A Body, nope, C Body, nope. Y body, nope.