If you "draw" lines from the front marker light to the Challenger script/emblem they appear on different planes (one appears "above" the side marker, while the other appears "in-line" with the side marker) on these factory pics, like most things Mopar there are many variations, just like the R/T emblem placement on 70 challenger grilles, So IMHO whether you use factory prints, actual measurements from any source, a guess/estimation?, there will always be someone to "challenge" your final decision regardless of your source