antp I think you missed the Bronco II comment. Can you remove the [U15] from the smaller Bronco II?

Their codes were:

[U12] - 4x2 model 1986-1990
[U14] - 4x4 model 1984-1990

http://shopkeysupport.com/sk5com/vin/vin.pdf

Thanks!

Edit: When you applied [U15] to the Bronco the system must have added that code to the smaller Bronco II