They just came out of my Herman Miller Aeron Chair Size B. The chair was an older model but these look just like the seats on the newer models. Not sure, I’m not an expert. Please refer to the pics to gauge condition. All the thread holds and frame should be good in good condition since I was still using the chair before disassembly. I no longer have the screws, however. I didn’t see any visible holes but then again I didn’t really look them over that closely so take a good look if you have concerns.