Cheers to Tone for spending his lunch break messing with this turbo.
We can now confrim the IHI P18 Exhaust housing will fit an from doing a Google tonight the larger P20 will also (but suffer a bit more lag), but both will require porting to match that of the MD304.
However, Tones spare VF24 P18 Housing also had the startings of a crack
.....
So the hunt could be on for a housing.......