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not to sure what your asking?
but measurement C should measure out to be 1200MM.
remember that on a unibody car you have 5MM of play ( that will be 2.5MM plus or minus )
what I'm not seeing is if they are measuring from the center of the holes or from the edge of the holes opening.
I do not have the factory manual for this.
looking in my chassis measurement book it states that :
all bottom view dimensions are point to point.
holes are measured to closest edge.
bolts and studs are measured to center.
so check for notes in your book to see what and how they are measuring the chassis.
to get proper measurement you need to use a tram gauge things like a tape measure will give you a faults reading.
we use a Celette frame bench so measuring is not used as the measurement pickup points are done by the fixtures of the bench.
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