If you experienced an IMSB failure the engine has experienced collateral damages well beyond the scope of just the IMSB failure. The collateral damages from these failures is always more than just the primary bearing failure, especially when someone drove the car to death rattling and leaking oil.
Its not as simple as replacing the bearing, more than likely the IMSB tensioner paddle is also snapped in half, at least..
To illustrate this simply follow this link to the current engine thats apart on my bench right now... Its all posted in this album on our Facebook page. This one was also "driven to death".
https://www.facebook.com/media/set/?set=a.492731007421366.125415.184464434914693&type=1