Local P.D. auto auction coming up in a week, and they have a 1991 Blazer, from what I can decipher from the vin # they have listed is it is a 1/2 ton diesel model.They don't give out any other info before on vehicles, other then vin#, and you can't "view" them until the morning of the auction. I don't want to waste my time going if it isn't a K5 1/2 ton Diesel model. What letters in the vin code and position would tell me if it is one. The vin#is: 1GNCT18ZYMO1------.