Just wanted to add this as well...
There are actually four types of these wheels. 1970 had a 1x5/8" oval hole and 71'-75' had a 1 x 13/16" oval hole. 77/78 had a 7/8" round hole and 79'-81' had a 1 inch hole.
I myself have 11 of these wheels. Six of them are 70'-75' style with the oval hole for the valve stem. The other five are 77'-81' with the round valve stem hole. I have not measured to verify exactly what year, etc. However, three on my car are supposedly original to the car, early built date 72' car. And, I have three that are originals removed from a friend's 71' Z28 Camaro.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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