In the year and a half that I have been consumed by this car, I have amassed a large store of links to products that I needed (or thought I needed). There are also a lot of general interest "maybe in the future" sites that I have bookmarked. I bet most people here have done likewise. I can't say the business at the other end is honest, reputable, still in existence or otherwise but you may see a link of interest and follow it to the purchase of just the part you've been looking for.
In that spirit, I will start this thread with one that seems to consume quite a bit of discussion here.
Manuals for 107 Models
Feel free to add your own interesting links.