Sounds to me like the 70 Cuda has the wrong passenger side mirror on it , the first difference is the base length , the 70 had a short base 3.5" approx long just a bit longer then the screw holes , the 71 up had more like a 5" base , as stated above the 70 only had an Oval mirror on the drivers side & a tear drop shape pointed at the outside edge on the passenger side Painted or Chrome , 71 up was oval both sides . I have seen the 70 passenger mirrors sell for well over $300