This model will work for both left and right sides of the headset. You have to replace both the front and the back of the hinge for each side that you want to replace as it will not mate with the existing shell pieces. Also, for the back piece you'll have to cut the existing piece to free the cord, I just used my flush cutters that came with my printer for that.
Use m3x16 bolts with m3 nuts, specifically I used some with a tapered head on them.
This is the kit I got the screws from.
I may adjust the model a bit more, I'd like just a bit more grip on the headband and on the yoke.
The author remixed this model.
Made a decent amount of changes to the original model, which I'm very thankful for because it saved me a lot of work making from scratch.
I adjusted most of the tolerances to assemble a bit better after printing . Made clearance for where it mates with the metal of the headband itself. Tightened it's grab on the yoke a bit to make a it a bit stiffer to adjust. I also tightened it's grip on the headband part as well, while giving a bit more clearance to the cable.