Oh,
Beware. There is one on ebay that is claiming to be 70 thru 74 but it has four square corners. That is not correct. You want the ones that have two squared corners and two rounded corners.
Also, if you find two that are for one side, you can drill a hole in the right location for the lock rod that protrudes the cup. I had to do this myself and looks pretty good. And it really can't be noticed unless it's a show/judged car maybe.
But there is a difference in the right side and left side. Just so you know.