Get a funnell and 4 feet of clear rubber tubing from the hardware store. You can use that to fill the manual tranny from the engine compartment (master cylinder area). SUPER easy to dump fluid in while you are standing up next to the car.
What could be more convienient?
The Mobil 1 Synthetic ATF is based on Dex 3 and it feels REAL nice when you shift. You will notice the difference. (4) Quarts is all you need.
-Mark.