Anyone out there have the experience of replacing suitcase wheels? You would think that the internet would be loaded with "Travelpro Wheel Rebuild Kits". But you would be surprised, there are none...

Heres what I've got: Travelpro suitcase, I believe my wheels are 72mm, they have bearings. But what diameter size bearings? Why do I have to buy a 4 or 8 pack of rollerblade inline wheels for 2 wheels?

Someone help me that has done this...what did you do?...