Yawn!
What Brian did was buy a gazillion screws and sit and sort them into bags to fit all the fairing bolts on the K13 S only from memory. They didn't look as 'smart' as the originals as the law had changed to make all bolt manufacturers stamp the type of material on the head of the bolt but that is now true for all new ones I guess.
I can't remember who supplied them but Kays Fasteners is my current preferred supplier for nuts screws washers and bolts.
As to your comment about washers...K fairing bolts don't have placcy washers as standard. Being anal, I make my own from coloured plastic bottles.
The cheapest place to get replacements is your local BMW bike dealer. They must have boxes of the things in their workshop because every time my bike goes in, it comes out minus a bolt or two