Yep - D1 and D2 are either side of the engine bay going from the base of the footwell up to the uprights where the rear front suspension mounts are. As I looked at it I did wonder if it was to do with fitting things in - so that sounds logical.
I did all the measurements off BR12 - it was 5mm short from B12 to BR10 (so in the cockpit basically) and another 5mm short between BR10 and FF1 (so in the engine bay). Can't imagine it's a major problem though?
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