Talked with the guys overseas and the got me all fixed up for a very reasonable sum
If it's a KS sprocket from the "guys overseas" source that swore up and down to me that there were no difference in size between the KS and ES sprockets it will be interesting to see if it's a sloppy fit or not.
I got a handful of KS sprockets and they all were a sloppy fit on the splines of a ES and a Hitchcock's crank. I ended up removing gears off of ES sprockets for both of em.
This might be one of those things that you really need a box of a hundred sprockets and find the one that fits just right on your crank.
Let me know how it turns out.
CJ