I think you've got confused. RS2 is absolute correct. The 406.9mm dimension is how much it sticks past the 25mm chassis rail, BR12. So add your 25mm for the rail, then lose 3mm for chassis plate CP1 and your on 428.9mm. So not really a far off the 430mm measurement given.
Bear in mind that its only rails 2,7 and 4 that need to be square for the mounting of the suspension, the RS10 rail could be all kinds of wonky and it wouldn't affect the car in the slightest.
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