Warning for anyone running RallyDesign's PolySport (or maybe even PolyRace) bushes
Having just removed some from my front arms, I have discovered they are only 50mm wide and not the OE 52mm wide. This pulls the shell mounting point in when you bolt them up, and will leave you having to find a way to bend it back out when you change to an OE sized bush, or it won't fit.
2mm doesn't sound like a lot but I'd probably rather not have my shell pulled in further than it should go.