Passat (B6) :: Cannot Shift Into Reverse

So, on Sunday, I'm driving around town, on a nice straight road. All of a sudden, I hear a hiccup or a funny sound from under the engine compartment. I didn't think much about it, but noticed during my next shift, that the shift was not that smooth. Running errands, I keep driving. Getting to a local Kinko's I stop, take care of business and go on, noticing still the notchy shifting.

Next is Target. I stop in, get my crap, come out and need to back up and guess what? No matter what I do, I can not get my 6SP manual Passat to go into reverse. Grinding gears, I finally get a hint of reverse and the car moves out of the spot enough for me to pull out and get out of the lot (where innocent bystanders must be thinking that old line 'grind me a pound' in their head after listening to that).

I get home, pull in the garage and wonder what I might find with the shift cables underhood. Nothing. All looks connected, not bent. Nothing unusual. Then I grab a flashlight. Then I notice it. A pyramid shape piece of plastic is under the shift selector on top to the transmission. What the? After a few minutes, I fish it out and notice it looks like one of those mounts on the bottom of my engine cover that retain it. Oddly it is the plastic boss that has broken off not the rubber grommet. And sure enough, the cover is fitting like sh%t and is missing one plastic foot/pyramid.

The good news is that it shifts again. The bad news is besides the engine cover (a cool $210 through ECS Tuning) is that my oil cap is split in half and is missing the top. I've never done this type of defect before, but knowing I can drive it like this for a few days, I closed the hood and went in and had a beer and told my wife that my Passat's future is starting to look iffy. Mostly that was emotion speaking, but can you believe that?

Where to get a oil-fill cap? Should I just go cold-air instead of a new engine cover (same price for a new Neuspeed cold-air kit)?