[tatter06]

Thanks  for the info, hadn't realised they had been around so long, new to me. 

I found an sw and an aw with bushings in place, can't be 100% sure they are original nsr bushes as I usually swap them out for 2.38 but they look fairly standard. Measuring both gives

Sw 30.4
Aw 29.5

So allowing for tollerence of chinesium calipers the 29.9 is probably the most likely. I was surprised they were different widths. 

Yes I can see the sw would need to be cut away there's barely enough room for the motor wrapper.

I will order some of each length anyway as I would like to try them on an sw too.