There are quite a few springs I know of, the Zetec for example has sports suspension but I don't know if it's just stiffer shocks, either way it's different!. I know the 2.0 has different suspension to the 1.6 (Petrol) for example as it's much lighter and therefore suspension is different. I think the Diesels would all be the same as there is only one engine IIRC available in the MK1 Focus that being the 1.8 unit?

Martin