Well, as in I've just spent £1100 on bodywork which has kind of blown the budget

so there's literally nothing left but I'd like to finish the look if I can.
In the link I put up, the caps are £25, and I've already had someone offer me some standard 16v spring that they were going to bin as they's just upgraded.
so if this is and acceptable way to lower a car I'm looking at 25mm lower for £25 kind of cheap! but that only deals with the front.
Or I could maybe manage £30-40 for some second hand "branded" 30mm springs that I'd be happy to clean up??
I just want to know how these caps work and if it's an OK thing to do and what can I do about the back? ta,