Hi there I have a mk5 escort cossie replica based on a escort si. The rear axle is an rs2000 one with 273mm solid discs. The front ones are 240mm ones and I was wondering what a good upgrade would be to this? Will 260mm series 2 discs fit straight on with no mods? Should I go for a 283mm sierra 2wd conversion? Let me know what is best and easiest... Cheers