I bought an old H150 diff from a B310 about 2 years ago, and with it i also got some leaf spring to diff mounts.

 
Today i thought i would see if the rubber part in it would fit the leaf spring to crossmember centre mounting pad in my spare crossmember.
 
So here is the rubber on its own from the B310 part.

 
SUCCESS!
 
It fits the crossmember inside thickness, leaf spring outside thickness, locating hole in the crossmember and even a high tensile 8mm cap screw fits inside the bush and suits the leaf spring pack.
 
   
 
Have any of you used one of these for this?
Hopefully i have found another 1000 part for all of us.