As the title said, these are good. Well-made enough, and exactly as described. I wished they were ball bearing load bearing for the posts and wheels, but both are just pins w/o bearings.
So, I guess they're "authentic," but sometimes incorporating new technologies into what's obviously a repair job can make everyone - the repairer and the customer/user - a bit happier. Still, they're good quality, were the best option to fix an old desk chair that others had fixed multiple times, and so I'm good.