Peter, anti roll bars are free - see appendix 9 of Appendix K - but the position of the wheels is not! There is a usual tolerance of 1% for dimensions in Appendix K (bizarrely 1.1% for wheelbase) so to me that means the castor cannot differ by more than 1% from the standard. Some front wheels of Lotus Cortinas are now so far forward that the front of wheel arch has to be modified to clear the wheel. Just like they were in the day.....
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