Ok all I can confirm that the B64 is to wide across the front axles to pass BRCA National and Regional scrutineering as it fits in the box but then the suspension will not depress which I believe the car needs to do to be legal to race.
Just checked the updated BRCA 10th Off Road 2017 handbook here is the relevant section
Quote:
23.3 The dimensions must conform to the following:-
Maximum length - 460mm inc. bumpers
Maximum width - 250mm at any point of suspension travel in a vertical plane.
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