My SLS mounts just got delivered a few minutes ago, can't wait to install them tonite. Not sure if there is a difference in the bracket that broke but mine feels like aluminum, very lite weight.
Update... mounts are in! Feels good, a little vibration but not excessive. shifting from Park to Drive feels very positive, even got a little wheel spin in the garage. I'm going to keep an eye on that bracket between the engine an the mount, not too comfortable with it, especially compared to the factory cast iron peice.
Overall a nice upgrade, well worth the $$$.