1/10th off rod has used a box for longer than i can remember, also, it's the full travel of the suspension (up and down) that is checked which usually means if your car is bang on 250 in a natural state, it would be under 250 when pushed down and greater when raised up so would rub on the box and not be legal.
Same rules for everyone and demanding they make an exception for you won't get you anywhere other than an early journey home! (certainly not at the nationals or for that matter the regionals i've attended)
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