just bought a older 8x8 Argo. Its vehicle #40843 and model #NKB8067. it has a 18hp Magnum Kohler motor. it has splindled axes. looks in good shape, though it does has 3 chain adjusters that are broken off. Trying to find out year and any info on any issues with that model year. I think it a "1987" but would like to confirm. Any help would be appriated!