This is vaporware. They have been touting these clutches for 10 years now and no one has seen one yet. Best bets are (in order of cost) the Siebenrock "better than stock" ($), Stock BMW ($$) or the Siebenrock oil proof unit ($$$). BeemerBoneYard carries the Siebenrock units.
And yes, any thicker than stock and you have to modify your release rod to accommodate it.
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