Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Def a 550F and not a 550K?
James picture is of a US model, big indicators and a chrome rear light bracket. Steves is a UK model, small indicators and black light bracket.
The picture of James bike is a usa F2 (Super Sport) and steve's one is also a F2 UK. If you are looking at a 1976 it should be a F1, it should say on the frame number.