After market parts. Cheap! Plentiful! Wrong!
Nutz. After pulling the front bumper assembly off of my 1997 Jetta 2.Slow Gt I find that I have the wrong radiator.
Things happen. BTW, the leaky radiator that came off the car is a Valeo with a VW sticker and part number.
Maybe I should change the oil while the front of the car is off. The filter is right there! 
*sigh*
I usually just jb weld the end tanks and enjoy another decade. Mishimoto makes a decent alum one.
No company on the planet has more wrong options for parts than Volkswagen.
In reply to Streetwiseguy :
BMW is pretty close though!
VW can be special because they may source components locally, and they build all over the world. And the parts catalogs do not differentiate between WHERE it was built, just the model trim - some trims were only built in Wolfsburg, for example. This is not useful if the badging is gone and you are not a total VW nerd to know what trim is what.
They also do not seem to care much about model years.