Have a set of AST 4100 Coil Over /w Swift Springs that recently came off a car...well mine. They have ~40k miles on them and they WILL need a rebuild. New they go for 2500 or so + the Swift Springs. A rebuild will cost about a grand I think. Looked into it before and forgot the numbers. Might be less, depends on what all needs replacing. So whats this set that does need a rebuild worth?