Why are you looking for springs? is it sagging, and you want more height?
Our 93 is low all around, and our driveway is next to impossible in parts where there's a rise as you transition from street to driveway. With more than a driver in the car, it scrapes... Sounds like hell.
I have been looking into lifters, as I want the car to be a tad taller for this part of the driveway. I found some spacers that sit on top of the front strut, accompanied by longer bolts of course. Maybe there is a rubber pad that will help in the rear? I have seen this kind of item in the past, but can't remember where at the moment. I recall they came in different thicknesses, too.
Maybe someone knows where these are available?
Good luck, and please post your source and results if you find a solution!