If you are just wanting to change over to 4 stud hubs (am i right in assuming that you have 3 stud at the moment with a mk1 1.1?) then you DO NOT need to go to the extent of changing the Anti roll bar or wishbones etc.
The bottom half of the vts strut can be used on any saxo. If you're lucky and know what you're looking for you can pick up some for about £40 with the same bearing type already inserted to match the ends of your driveshafts.
If this is the case then you WILL NOT have to replace any other parts.
The above is the cheapest way to swap over. If however you do want to fit the VTS anti roll bar and wishbones aswel then these are an easy swap. All the necessary bolt holes for the VTS arb are already in the chassis of every saxo, and the wishbones are an easy swap too