Tires

I am looking at getting new tires for my Outy 450. I do allot of trail Riding also Mud & snow. I am looking at these tires

Zilla
Mudzilla
Mega Mayham

Old 7 digit VIN

Anybody know how to decipher the old 7 digit VINs. I Found an 88 trailboss 250 for sale, but the frame was painted and I was only able to make out 5 of the 7 digits. I think I missed the first digit is which I determined is probably a 1. I'm at a lost as to what other digit I missed and what number it could be.

Thanks,
Mike