242GT Which box will go into an 850 without major issues, anyone know ?
M56 from an 850 and (I assume) a P80 x70.
An M56 from a P2 or x40 M56, will bolt up to the motor, not 100% sure about the mounting points.
Some good M66 into 850 info here:
https://ovlov94blog.wordpress.com/2017/01/26/m56-to-m66-fwd-rear-engine-mount-fabrication/