I fought with my air filter, too! Used a Mann replacement that could have fit a little better. My guess is that the engineers never had to replace one, just get it into the car when it was built and they were done. Hmm, I've got to think that they are smarter than that, what are we missing?

Also, I recommend using the oem brake fluid which can be bought here:
http://fcpgroton.com/P2Series/P2brakes.htm#fluid

Use the dotblue or the dotamber. They are the same thing, different colors. Why you ask? Use a different color than what is in there and you can easily see when it is thoroughly changed over. Also, at least when the blue is used, you know that you have the dot4+ stuff. It is compatible with dot3 and dot4, but has a slightly higher boiling point and somewhere on the web there is info showing that its water absorption over time is lower.

fcpgroton is a good supplier, get yourself some oil filters, a cabin filter and brake parts at the same time and the shipping becomes insignificant.