Unfortunately, this is the mysterious question. I've googled the hell out of this question, even asked the local ktm guys, their not sure, they haven't worked on one yet, nor have they received any parts to do work on the 1290. And it's known that ktm sometimes uses 8.9mm and 10mm shims I guess. I was just hoping to come across a super duke guru on here that knows the answer to this question from their "mysterious force".