oldtek - you don't have a "C60", the "C" designations didn't start until later, the 'Viking' name was on medium duty trucks, and yours is a 6000 series, the first 2 digits of the vin will indicate that, and wheelbase:
6A = 6100 132.5 WB
6B = 6400 156.5 WB
6C = 6500 174.5 WB
next will be "59" [year], then one letter to indicate the plant of assembly, maybe an L or an O for Oakland, then the assembly sequence or ID number
Bill
