There's a hex plug on the driver side wheel of the tranny. That's the one you fill to the bottom of. Obviously, you'll need to take the wheel off and use a long funnel to top off the tranny fluid. Hex plug is 17mm. Same as a lug nut if you can't find a large enough hex key.
I do know that I drive torque, while listening to my friends prattle on about horsepower.
www.brokevw.com... pictures, capacities, everything anyone needs to know about the 020 tranny.