Selling a set of trickflow double valve springs with damper. Came of SBF TFS twisted wedge heads. Includes 16 double springs, 16 retainers and 32 locks. Complete set to upgrade single springs to double. Springs check in at 130# at 1.780" installed height and 350# at 1.230" open (.550" lift). All in good condition. $100 all. other mustang parts: http://mysite.verizon.net/vzeq1dk2/id2.html I accept paypal and can ship with tracking info.