DDK - Die Deutschen Klassiker

Hi Guys.
I have finally decided to change my brake light set up from the USA spec all red to the European red/amber twin filament set up.
Only issue is how is it wired?
I cannot seem to find a UK spec wiring Diagram.
I have a manual but it’s the USA version.
Any help would be very much appreciated
Thanks in advance.
John.

Any use?

I think that this one is for the single filiment bulb.
I should not that I already have the new bulb holders but don't seem to think that it would be straight forward as just running a wire from the brake light switch.
Or is it that easy?
There also apears to be a relay for the indicator/brake light.
Cheers.
John.