Replying to Hellbent with FKS 185?

I have a connection that can get me a pair of 189 hellbents for pretty cheap and I have a pair of fks 185's lying around. While Chris Benchetler was here for the Red Bull Cold Rush I saw him rip the 185 heel piece out of two pair of rockered Ak Enemy's. I've heard that the mount pattern on the binders is too narrow for the K2's but I was wondering if there is anything you can do to stengthen the mount or keep the heel piece from ripping out?