b310 control arms giv camber as the axle is at the same angle as 1200 struts (unlike B's and all the other Z's) but you need b310 steering armn as the bolt spaceing at the bottom of the strut is larger than 1200, and I think the track is narowed (provided all other geometry dosent change) because the wheel wheel mounting surface is closer to the strut or backspaceing is less (however it worded??)