The clock faces are blue for the K1 (The American K3,K4,K5 are also Blue) The UK K6 was green.
I managed to buy a luggage rack of ebay 6 months ago, they are a bit scarce! The UK manufacturer in the 70s was Tower accessories, Lythan St Anns-on-sea, Lancashire (Now long gone) Chrome carrier fits all CB750 K0 to K6 Part No 1039
Alan