My $150 gaming chair did not come with them! I applied white silicone grease to the parts, cleaned and lubed the gas cylinder cover and installed with ease. Flipped the chair over and tested. Still creaks, clicks and pops. I also tightened all screws and bolts to the chair to ensure sturdiness.
https://www.amazon.com/Replacement-Hardware-Repair-Office-Cylinder/dp/B00CEZ1EOK

