Loren, The number next to the K designates the Kelsey Hayes plant. Your NOS XT wheel would be deciphered as follows:
K: Kelsey- Hayes designation
1:Plant:
1= Romulus Michigan
2= Windsor Ontario Canada
3= Philadelphia Pennsylvania
0: last digit of year, in your case 1970
The 14×7 steel wheel that came on the Super Sport Camaro's in 1970 were coded CL.
This info is from the Chevy by the numbers book. I hope this helps, Rob.
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