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H&R RSS Coilover Springs for 2005-2009 Ford Mustang V6/V8 (S197) i10 AST Suspension designed the CompetitionH&R RSS Coilover Springs for your 2005 2009 Ford Mustang V6 V8 (S197) are optional replacement springs for H&R RSS Coilover kits RSS29170 RSS29170 2. These springs offer different spring rates. H&R RSS Coilover Springs are produced from special spring steel, with a strength rated at 290,000 psi resulting in unrivaled tensile strength and resiliency. Every spring produced by H&R comes from H&R's engineering and manufacturing facility in Germany.