Okay after some research it looks like removing the OEM rear trailing arm bush shells was probably a bad idea
Apparantly over size bushes aren't going to happen but hopefully a local machine shop can whip up some replacement shells.
In the mean time I've been playing with the
Nolathane site and I see the Z31 300zx bushes cross-over with N13/14 Sunny front lower wishbone which I can get locally ie; not the other side of the world. Also the quoted bush dimensions will fit
without the shells but I'll just see what happens.
edit: actually that can wait for now I've just spent over £100 @
Bilt Hamber