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The part number is VBK0087. A quick search brought up this place, but they're out of stock currently. If you're near an R&M dealer, they should be able to get you one.
Yes, I replaced the QR clamp with one of R&M's regular ones. They're 40.0, which is an odd size. Problem Solvers make 34.9-to-31.6 shims that open up more options for seatposts, that's what I used for this.