I have a set of front Strange Engineering externally adjustable (10 way rebound) struts for sale. asking $135 shipped for the pair. I will have pics upon request.
not sure on the mileage when i bought them but they have roughly 6,000 miles since i installed them. The guy i bought them off of had them installed on a track car that they trailered to the strip so I dont think they have a whole lot. The rebound adjustments work great still.