jmeecer, I'm assuming you have a Gen1? (Disclaimer, I'm on a Gen2).
The degas bottle has 3 hoses "attached" to it: 2 of them actually connect to it, 1 of them merely "hangs" on the degas bottle and does not actually connect to it (the heater air bleed hose).
I'm going to start by saying that whatever route you choose, don't forget to buy a degas bottle cap (9C3Z-8101-B
@Tasca @RockAuto), because neither of these options come with it. It's under $10, so no point in keeping your old one. On the other hand, it's the easiest thing to change.
The Motorcraft degas bottle (
5W4Z-8A080-AA) comes with the coolant return hose 8C289C (attaches to bottom of the bottle via the tube pictured in Dale's screenshot, post
#53) AND the heater air bleed hose 8C289B (that only attaches to the degas bottle). The long hose 8276 (the actual degas / engine vent hose) that runs from the thermostat assembly to the top of the degas bottle does not come with it. XW4Z-8276-CB ?. I don't think people change it.
The Uro bottle is exactly the same as the Motorcraft bottle (the exact p/n I had originally installed was 3W43-8A080-AA), except that it comes with no hoses. I bought this bottle and installed it this weekend - hopefully will post some pictures soon.
If you go this route, you will want to buy the coolant return hose (8C289C /
XW4Z-8C289-FA) mentioned above. Not only is the old one, well, old, but you are likely to break the old one in the process of removing it, possibly out of frustration. People say it might be easier if you just cut the old one. I think I punctured my old one by mistake with a pair of hose pliers. The nice thing about the new hose is that the snap rings (it comes with both) are glued to the hose, in the proper orientation, which actually helps with installation, in that you can pull on the metal ring rather than the hose to position it. After buying this item though, I didn't save much money by avoiding Motorcraft, so see how much the total is, especially if you're getting it from different sources.
From what I've been reading, you can't buy the heater air bleed hose by itself anymore. Personally, I'm fine with it. I don't know the p/n.
I don't know what KM-4566 / YW4Z-8C633-AA is about or where it goes; I had the same question. It is NOT the coolant return hose (8C289C / XW4Z-8C289-FA). After doing my shopping list/inventory, I don't see where it would even fit in. I have a feeling that it might be Gen1 specific part, but not sure. Notice from the pictures that it has a bracket to attach it to something at one end. Also
Tasca describes it as: "Sub tank. P/s cooler to resv. 3.0L, 2000-02, cooler to reservoir. 3.9L, 2000-02, cooler to reservoir." Power steering? Anyway, I no longer trust any of these part store descriptions.
Hope this helps. Take my words with a grain of salt though, since I know nothing about Gen1, except that the degas bottle parts are shared.
Your diagram from post
#50, for the short p/n on Gen1 (notice some inconsistencies, so maybe look for a better version if you can):
