Various K11 problems, please help!

Hi, I'd really appreciate advice on some problems I've had with my 2001 K11 recently.
It's been generally running ok, however very bumpy. Lifting the gas pedal even slightly causes the car to jump and jolt a lot, this also happens when changing from 1st to 2nd gear. It also feels quite sluggish, and is struggling more than normal with hills, even in 1st gear.

Any advice on the following things I've noticed would be great:
1. Noticed this very loud noise accompanied by a leaking sound outside the car whenever I leave it running (in neutral with handbrake) (video attached)

2. Loud noise I think is coming from the alternator bearings, not sure if this is normal (video attached)

3. There is this part just to the right of the engine that isn't attached to anything, not sure where is should go? (video attached)


4. Oil has leaked in a few places, including the bottom of the gearbox (photos attached)
A9277CB9-6034-46DE-A154-10E112C11BA3.jpeg
AF1079D1-E858-4E0C-9341-B38B7CEF4646.jpeg


5. There is another loud whirring noise everytime I put the clutch down (both while in neutral and in gear)

Thanks for reading!! Any advice would be greatly appreciated!! x
 
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