Someone asked about this awhile back and we posted some measurements then, do a search for "door mirrors" here. That said, I can say that the door mirrors from 70-71 were pretty close (there is some debate about this). If yours are "way" off, then someone may have installed different mirrors at some point. There is a different in mirror (and base) design between 70 and 71-74 (70 mirrors are more angular and the bases are narrower) however the hole spacing is not that far off as I recall. I put a 71-74 mirror on my 70 Challenger (later changed back to a 70 mirror) and the holes were close enough to work.