We have 6 custom valved Bilstein SN series mono-tube shocks with 4 coil over kits for sale Shocks were bought new in March 2014 from Alan Vochaska at Speedy Shocks for $1300 Custom valved for Mastersbilt dirt late model, or any 4 bar spring behind dirt car. Shocks are left front, right front, right rear, left rear front and left rear behind with extra slick valve right front shock. Have dyno sheet for each shock, 1 front shock needs a new shaft and eye.... The shocks worked great we are just upgrading to double adjustable canister shocks. http://www.bilsteinus.com/uploads/tx...ts_2010_14.pdf very little use on them, maybe 4 or 6 shows max since bought brand new from Speedy Shocks will sell for $850 or best offer for all shocks and kits call, text or e-mail CJ Heskett 231-578-5690 Muskegon mi outlawracing05@live.com