I'm not a machinist, nor do I own a lathe. I'm sure I could figure out how to make them if I did have a lathe, but $300 for some strut rods is cheaper than $5K for a lathe.
You could just use you original struts and add a Heim end. They thread right on. That is what most race car builders did in the past. Make them stronger yourself for less money. Never buy another piece.