I guess I meant built early in 1965; as I always tell my kids...go by what I mean, not what I say; thanks for straightening me out. It does have some 64-1/2 features I'm pleased with; chrome wiper posts and the letter A on the air vent knob.
Anyway, yes, the measurements are from the edges of the floor pan. The reproductions I saw were made in Canada and claimed to be correct; they obviously are not. Other than that I've only seen photos of partial and complete floor pans made by various manufacturers; all had the anchors set farther back.