I’ve had these for a while now and broke them an a few months back, but continued using them taped together. I decided to replace the tape and superglue the broken part, then I sanded down the glue until it was flush, then I added a vinyl skin to cover up the glue. I also changed out the old battery with a cheap higher capacity battery I found online, and I swapped out the ear muffs with better ones I found online. I did have to spend a little bit on this stuff to fix them up, but still a fraction of the cost of getting even a refurb pair. I think they turned out pretty well.
I love the ear pads. They were specific to the device. It was some generic brand (soulwit or something) but they had them for a few different models at least. You could try searching for your specific headset and see what comes up, or maybe you could find something somewhat universal to use.