Dang. I was trying to get back to you sooner but only got around to dragging out some of my spare axles today. I wanted to give a definitive answer before you ordered something.
I feel bad about that one. I found a sprocket that's for your application and I'll gift it to you. I've had it sitting around for years. PM me if you want to work that out. I'll clean it up and box it. Still has some life left in it.
It's a old Sunstar sprocket that apparently isn't made anymore. I looked for half and hour online and, nada. 3049 part number. The main thing is, it's dished, which compensates for not using the cush drive mess. Flat sprockets won't work, because the chainline will be incorrect.
Every single sprocket still available new for the old style, that I've found, only fits the original configuration. You're going to want to up-year that axle sometime, and they do interchange, along with the hubs. There may be a difference in length, as two different ones I have, which are for the 185/200 models aren't the same by about two inches overall. One of them may from 200E or M for all I know. I'm not sure what all these came from anymore. I'm not getting rid of my later axles though, after seeing the old conversion/solid sprockets aren't available anymore.
The later axle, as you've discovered, has a larger bolt pattern for the sprocket, but it also has a snap ring that goes on after the sprocket. Totally different sprocket flange.
Last edited by ATC King; 05-08-2020 at 12:04 AM.
The story of three wheels and a man...