Well, you may have a few of the numbers wrong so you'll have to recheck them. But what you have is as follows:
K1 - Kelsey-Hayes, Romulus, MI plant
86 - you need to check this. It should be something like 8 OR 6, which indicates the year (8 = 1968 or 6 = 1966). If it really is "86", they were manufactured in 1986 and not original to the car.
1 is the month - January
30 is the day of the month
XG is the wheel type
Ed