E30 Solid Diff Bush

As the diff on an E30 chassis is a stressed member and hard mounted to the subframe, solid mounting the diff is considered a must if you intend to solid mounts the rear subframe to the chassis.
Using a flexible diff bushing with solid subframe bushings will make the diff want to dip up and down when experiencing drive line torque resulting in bending on the studs securing the subframe to the chassis. 

This light weight solid diff bush is machined from 6061-T6 aluminium and anodised in CMP purple for corrosion resistance. 

Solid mounting both subframe bushes and the diff to the chassis also  increases chassis rigidity as the rear subframe functions much like a strut brace between all 3 points of contact.