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Previous reply should of read...I think you meant later K2's when you suggested some had a LEFT side petrol tap. Those later bikes had the extra hole at the left side of the mounting plate (and so three holes in fact).Chris R.
I think you will find that you use both the top and bottoms holes on the RHS, that is how my pipes are routed on my 73 UK K2.
Couple of photos showing the left hand pipe routed around the back , and a front view of the pipes coming through the back plate.
Not sure where I got these pics from, but they worked on my '74 UK K2. Same as yours Julie, 2 outlets on right side. (Attachment Link) (Attachment Link) (Attachment Link)