Bill
If you're looking for parts and you have no local vacuum shop to rely on then the internet is your friend. A search for 608RS will turn up dozens of sources. The hard part is knowing which one to use. I just did a search myself and it looks like Amazon has the bearings and the brushes, but I don't know what the part number for the brushes would be. Perhaps you'll be able to determine that when you have the old ones out. I simply searched Amazon for Lamb motor brushes and ended up with a number of choices.
Not knowing what your skill level is I should warn you that to change the bearings you'll need to take the fan housing apart and remove the fan. Extra care will need to be taken to avoid damaging anything, including yourself. The edges of the fan are sharp enough to cut you, so be careful. If you've done this before then you already know all of this, but if you haven't I can at least show you some photos of what you'll be dealing with. Folks here on the blog are pretty good about offering advice when you have a specific question, though it can take a while for the right person to see it sometimes.