Substitute for the roles of my Trolleys

I have used these three items in order (from TravelPro) to replace two plastic rollers my trolleys that were both suddenly broken by a flight and started to break, while the rest still looks like fresh from the factory:

Everything fits together well and the trolley moves thanks to ball bearing almost of its own accord. On top of that, the roles are much quieter than those of trolleys often used hard plastic.

The roles I had chosen because they fit the diameter (many are larger) and because they are buying individual; often they are indeed available only in 8-packs.