AST Suspension Lowering Springs (30mm/30mm TUV) - 1988-1993 Ford Sierra Cosworth (BEF/BFGC) Bronco The Riaction GT1 Coilovers for

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AST Suspension Lowering Springs (30mm/30mm TUV) - 1988-1993 Ford Sierra Cosworth (BEF/BFGC) Bronco The Riaction GT1 Coilovers forAST Lowering Springs for the 1988 1993 Ford Sierra (BEF BFGC) are manufactured from a premium high tensile chromium silicone wire which is handpicked by AST engineers for its quality and metal consistency. Each spring is cold wound and then heat treated to increase hardness and reduce internal stresses present after winding. Each spring is then individually shot peened, phosphate treated and then powder coated to outlast even the life of the vehicle.