I got a corrado fan shroud,, and a motor from a jetta (4pin) and for some reason the shround doesnt line up with my existing bolt holes.. almost like the shrouds is just a tad narrower (1 inch) then the radiator I have now??
That's probably because these were the only cars that used this rad fan setup (1991-1992 ECODiesel, and 1990-1993 Corrado VR6), at least in the USA.
As you've noted, the fan motor has the 4-terminal plug for a 3-speed fan, but only the correct fan will fit into the shroud and clear the radiator.
Unless the motor you have came from either of those 2 cars, I'm afraid that even if you get the motor mounted, it will hit the radiator or cause problems down the road.
Another thing to consider: you said you got the shroud from a Corrado. Was it a VR6 Corrado? The G60 (4 cylinder motor) and the VR6 used two completely different shrouds and motors.
Regarding the filter, just look up the air filter for the same year make and model, but with a 1.8 gas motor. They're exactly the same.