Hey Dave,
I have the kit from Buffalo on my '40 1/2 ton. I first replaced the front axle/spindles with '52 burb. The king pin spacing is the same and it looks original, to me anyway. The spindles are beefier than the '40 so might be more like a '40 3/4 ton. This is a 6 lug design. Original wheels sometimes need a spacer. He sells those too. I don't have original wheels so that is not a problem.
