The Travelpro FlightCrew4 Replacement Wheels Kit includes wheels, bearings, axles, and bushings. Plastic housing inserts are included. The included axles are specific to FlightCrew4 luggage and likely not compatible with any other type of luggage. If your axles and wheels housing inserts are in good condition, you may also order the regular 76mm Skate Wheels if you want to save a few dollars.
If you have a Crew4, not a FlightCrew4, you will likely want the regular 76mm wheels.
FlightCrew4 and Crew4 are totally different lines of luggage.