Strange,as said pics would be good.As far as I am aware the only difference for the tca's from a normal Sapphire to Cosworth is the diameter of the mounting hole not the shape.I am sure 2wd,4x4 Cosworth range are the same.Not 3dr,different ball joint being a castle nut not pinch bolt so I am stumped.
I don't know about the roll bar but it sounds plausible.