Call Bill Douglas, who runs Mavic Parts, at (888) 466-2842. He'll probably need the serial number for the wheel and can give you the parts list. You can also go to the Mavic dealer web site, which has all the exploded parts diagrams, etc. It's www.tech-mavic.com
. The log-on is 'mavic-com' and the password is 'dealer'. Never understand why Mavic won't make that information publicly available, but there it is.
You will need a couple bearing sets, an axle, lockring, and some miscellaneous lock nuts as well as the track nuts themselves. At least you aren't buying a freehub, but don't expect it to be cheap. It's easy to knock an axle out of a Mavic track disc (some teams do this routinely when traveling just so they don't get bashed around as much).
I have a couple of the current version Comete discs for the track, so I have first-hand experience with them. Frankly, this is a very old disc. These lenticular discs are incredibly harsh rides on the road and if you crash, you can punch holes in them. And a disc (even on the rear) becomes quite dangerous in cross-winds -- it's very hard to maintain control. I don't know that you really want to do this.