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I used to race but now write.
If you look at the HSCC Historic Touring Car Championship for Appendix K and HRSR Cars 2012 Regulations you will see under Technical Regulation 5(8).2 Prohibited modifications: “that suspension components must be of original design ... The original pickup points and mountings must be used. The original spring system must be retained though the spring rate itself is free. One spring may be replaced by another but not by a spring of different type. The common types are leaf, coil and torsion bar.”
Further Regulation 5(2): “If a model of car is Homologated then that car may use parts that appear within its Homologation papers up to December 31st 1966, and it may then be prepared to these regulations.”
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