I got a new desk chair a month ago and recently caught a caster on something and busted one of them off. Well I've just pulled the broken caster stem out of the new chair and pulled an old caster off the old chair and it fits perfectly. Infact it's the exact same design so you can't tell that's what I did. I paid $60 (Sam's Club) for the old chair and $130 (Office Depot or Office Max) for this new one... As I was building the new one I thought that all the parts looked very familiar, the size of the screws, the shape of the base and casters, only the upholstery and arms are different. All the actual hardware is the same. So much for paying more for a "higher quality" chair! lol!