I will explain the detail about your wheel:
K187 11 AZ: The "11" indicates that the wheels were manufactured in the 11th week of the year. The last digit "Z" represents the year 1970 or 1980.
K187 20 AZ: The "20" indicates that the wheels were manufactured in the 20th week of the year. The last digit "Z" represents the year 1970 or 1980.
K187 23 AZ: The "23" indicates that the wheels were manufactured in the 23rd week of the year. The last digit "Z" represents the year 1970 or 1980.
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