85' K30 should be your look up.
The first design was produced from 1973 to 1984. The first design remained unchanged until 1986. This design had drums that were held on by the wheel studs and had a smaller diameter pinion bearing than the second design. The second design was produced from 1986 to present. One change that occurred in the second design was that on some models the brake drum could be removed without having to remove the hub and axle shaft. Additionally, the pinion received a larger diameter bearing while the pinion stayed the same diameter, which increased the durability of the pinion. All these axle are full floating.