unknown mileage on them. but they dont have any leaks and still feel fine.
i bought them about a year ago used in good shape, drove like 3 events with them.
i am not sure of the spring rates but they are not super stiff and not too harsh on the road, if i were to guess i would say they are around 8/6. they can drop the car pretty low too.
$600+shipping
Dirty and paint peeling from brake fluid getting on them...

No problems whatsoever.