Other than the new roll restritors being aluminum, the ID of the through bolt hole is also different. I have exact calipered measurements at home, but the new rear mount's ID is smaller and the new front ID is larger. I'm currious what their motivation is with changing these.... but I know when my rear mount is stuck rotated up, it feels like my powertrain is out of alignment. After loosening the through bolt and letting the mount fall back down, it runs normal again. I want to look into having a custom core machined that fits the bolt (not 1 1/2 bolts) and offset the core in the mount, to be in the same location when the original mount is rotated down.
Hmm... if that doesn't make any sence, let me know.