The new design 2 piece that I Got is essentially like the old one with the circlip groove part cut off - back to the steel bush and then a tapered alloy piece to sit on top. If I had known this and could have bought only the tapered part I would have the old one machined down and saved some cash.
If the small tapered part is available separately then just get that it would be a quick & easy job to machine the old style carrier to the same spec as the new, actually it wouldn't be hard to machine a tapered piece if you've access to a lathe, the right material and the measurements - certainly I have a local engineer who could make one for less than Ducati would sell it for.
Pics show the 2 pieces separately which if you compare to the old style you can see how simple this mod would be - it is identical in every other respect;
http://mysite.wanadoo-members.co.uk/...45862133125544
http://mysite.wanadoo-members.co.uk/...45054931584038
http://mysite.wanadoo-members.co.uk/...14666547906022
And the finished assembly;
http://mysite.wanadoo-members.co.uk/...91122518105882
And this shows the damage to the swingarm caused by the sprocket carrier moving towards it
http://mysite.wanadoo-members.co.uk/...02798686279772
