Only plastic thing would be 3GBP, and whole knob with fittings 5GBP + shipping some 4 or 5GBP with tracking no (do not know right amount, need to go to post office)
Please let me know if this is all right for you!
Thank you!
EDIT: forgot to tell that spring and nut are zink galvanized. When i have send parts for galvanization for my restoration have send all small metal things so i can have choice tu use best one.
Also have 3 in black
The melun replicas in beige aren't the same colour of the original ones, just if you fancy fitting only one and you pay attention that they look all the same.