the H145 1200 diffs a common as muck (smaller ones), but tend to suffer the same fate as your current one if they are abused.

The larger H165 tend to be hoarded by those that have em, cause they can take a bit of abuse without self destructing.

In all honesty, i would just chase down a direct swap and not drop the clutch as much, but thats me I guess.

But in saying that, I think the 120Ys came with a BW diff as well at some point. You will have to confirm what diff centre you have, photos perhaps?