I am still redoing my SIL closets that are original to the house (1965). The hangers & shelf, similar to yours but round rod, are still in good shape. I replaced the wooden round rods because someone decided to paint them & the paint flakes off on the clothes.
They still sell that round style at our local Menards. Would it be very hard to switch them out? The wooden rod was easy to cut down & I've been able to keep all of the other shelving parts. I was glad to see that they are still being made if I need them.