find how i got decoded this 3 result in vin numbers

Job ID: 36450731

Budget: $30 – $250 USD

i got this 3 vin numbers:

JN8AZ18U19W103434 = 16715
JN8AZ18U39W103435 = 16712
JN8AZ18U59W103436 = 17954

i got this 3 result from the math of this vin bumbers:
i have been researching in google and it said that i can have this from the 9th position number and the last 6 numbers

if anyone find how to decoded and make the same result as i got there i will pay for this, NOTE: i will pay untill we test the result with other vin number