[Qmulus]

It looks to me like the clutch on the alternator spun off somehow. Weird... Does the alternator still spin? How do the idlers feel? How about the water pump? Check them for smoothness and any play.

As for the coolant fitting, I found that brass PEX crimp plumbing fittings work well and have sizes that work great. Cheap too. There is a plastic T used near the coolant reservoir on many late '90's and early 2000's Audis that fails often and a 3/8" brass PEX Tee replaces it perfectly for $1.25. I showed them to a local independent shop I work with and now then buy them in bulk. My guess is that you could find something that will work better than the factory part for less than $5 at Home Depot.

As for the alternator, you can get rebuilt units or grab one from Woodie for even less. They really don't fail often, so I wouldn't worry too much about using a used one. Get that stuff back together and see what else you find. Hopefully it will be OK...