Hello Davy.
It depends upon how original you want. As you are UK, your best bet is David Silver. He will have all those parts. Check the "General FAQ" for a longggg list of sites that supply parts.
How did you come accross a K2 in UK? I didn't think that it was imported. (My '72 has a K2 engine which must have been an import at some time).
Post a pic on "Where are you in Europe" or "What Bike?" poll (or both).
Steve
Poll