Question about a freewheel hub...?

I like the old school hubs like Red line and Suzie with the conventional freewheels, they were pretty much bullet proff. But as far as cassette hubs the advantage is you can rebuild them and gear changes are quicker, you may only need a driver so check that first. Most are interchangeable, If you have one laying around match it up to your old one. If you are ordering one, order per the hub manufacture. But in reality you probably only need the driver. Good luck!

I have more experiance in BMX there is a dude here named Fluffy he is a experianced MTB shoot him a e-mail he may have a better answer for you.