So I tried to reuse my billet brackets with the new 5160's, but the remote reservoir is now slightly taller and there's only about 2/3 of an inch between the remote reservoir and the tire. That's too close for comfort for me, so I'll be going with the frame mount.
On an unrelated note, I damaged one of the fasteners used with the frame mount, and Bilstein wants to charge me $30 + shipping for that part. McMaster-Carr price is $13.20 for a bag of 10 of them. Not happy with Bilstein customer service today.