Factory Steelies

[Senorx]

What was the factory backspacing on the 15x6 white steelies? I found this picture on the interweb of a Kelsey-Hayes/Motor Wheel 15x6 Steelie. It appears the backspacing was 3 1/2 inches with a 3 1/2 center hole. I also found a Kelsey-Hayes 15x8 Steelie (the unicorn of wheels) and those appear to have a 3 7/8 backspacing.

I know some of you have actual stamped and verified Kelsey-Hayes steelies. Can anybody verify the backspacing? We can put this baby to bed and this information will be forever documented and archived on this forum for future curious minds like mine.

BTW, the company where I found the pics claims to have stamped and verified Kelsey-Hayes wheels. If so, I'm sure they are a small fortune. I will attempt to contact them and get a price in order to satisfy my curiosity.