Sorry I didn't see this earlier. I have done the bolt mod myself on both sides. You don't need to get them from ERA if you have good mounts. And I'll show you the shims and tell you how I installed them.
Here's Kramer's thread on this issue. See the last page for my solution:
ERA folks...please help / getting frustrated
You're one us now and you have local ERA experience to benefit from
You HAVE downloaded the manual haven't you?
Sam