Fixing an IB5+ XR4/ST150 box

[Sam7]

Anyone got any good ideas to fix a broken IB5+ diff housing? Looking for a replacement IB5+ casing seems difficult. Sounds like fitting a MTX75 is possible but requires moving the lower mount which would be difficult to certify. There's probably a Mazda box that will bolt up but they look quite bulky so I assume they'll have similar or worse issues as the MTX75.

Not sure if a standard IB5 can be adapted but I suspect not.