On some models they can be changed with VAGCOM to have either two fog or two reverse.
You can, however, do much the same thing by simply connecting the two input terminals with a suitable wire.
There's a DIY for that somewhere, but you really shouldn't need one.
You'll then have two lights when in reverse and when you turn the fog on.
Can't comment on the legality, tho', and note that one of them will be red unless you take the filter out of the fog light.
Incidentally, I can't recall ever using the rear fog on mine.
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