K - manufacturer (Kelsey-Hayes)
1 - manufacturing plant (Romulus, MI)
Y - last digit of year
M - one or two digit month (1 thorugh 12) for month of year
D - one or two digit day (1 through 31) of month
AZ - 15X8 wheel used from 1969 through 1982
The problem comes in for wheels with the following codes:
K-1-8 8 through K-1-8 12 -- could be either Aug thru Dec 1968 or 1978
K-1-9 1 through K-1-9 12 -- could be either Jan thru Dec 1969 or 1979
K-1-0 1 through K-1-0 12 -- could be either Jan thru Dec 1970 or 1980
K-1-1 1 through K-1-1 12 -- could be either Jan thru Dec 1971 or 1981
K-1-2 1 through K-1-2 10 -- could be either Jan thru Oct 1972 or 1982
I have the original wheels for my 72 but they are out in the storage shed under our other vehicles summer tires rims so won’t be able to check until the spring. I have noticed that more classic car owners are keeping/switching back to the original 15’s and going with Vitour Galaxy V rated tires. As to price - no idea.