Stiffer upper coil insulators quicken spring reaction times while insulating the chassis from unnecessary noise. The polyurethane material outlasts the original soft rubber units and are mandatory when using any high-rate coil springs. To be used with our high performance contour front springs. Fits 1964-73 Fords, Mustangs, and Shelbys. Thin type (CINS1): to help lower car 1" with springs. Thick type (CINS2): to keep car at standard height with springs. Price per pair.
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