Eibach Springs Inc. 3510-140 Pro Spring Kit - Ford Lowering Kit: 1979-1993 Ford Mustang V8 except Convertible 1994-1998 Ford Mustang Cobra except IRS & Convertible 1999-2004 Ford Mustang Convertible 6 Cyl 1994-2004 Ford Mustang V8 except IRS & Convertible 2003-2004 Ford Mustang Mach 1; Pro-System