strut rod nut size

I have been a mopar freak since the mid sixties and have never run into this problem. I snapped off the threaded end of my strut rods trying to get the nut off. In the process of making a new strut rod I discovered that the threads are 14mm x2.0 . Has anyone else run into this? In have owned this car since it was 3 years old and it has never been apart before.As a side note on the bushings cupped washers, mine were cup toward bushing (I have seen there is a ongoing debate on which way the washers face)
this is on a 68 fastback cuda