I believe the difference is between LWB and SWB rather than SII and III. SWB has the same diameter front and back.
Dullbird it might be worth having a look at the SuperPro bushes from Fulcrum. They are not cheap but from all reports are good quality. I have them in one Game but they haven't been in there long enough to talk about reliability and longevity. In the other Game I have a set from Polybush in the UK. There is honestly not a lot of difference in price as Polybush are supposed to be the best over there in the same way that SuperPro are over here.
I am not sure that the cheap ones like Britpart are worth the money. I took some out of one of the games that had just crumbled to nothing. One of them I could not even find any bits of. I don't know what brand they were but it made me decide to go for quality.
TimJ.

