It ain't that much of a rewire - one side is almost the same except you switch the top two round, the other side is inverted (and then swap the two around).
basically, the mk5 bulb holders are the same left and right - mk4 has a LHS and a RHS. Hence why one is inverted. Other than that, you swap the top two round because the indicator is now in a different place.
there's a post on here explaining the conversion mk4 - mk5, so it's a reversal of that for you
right side means slicing off the two studs on the plug that goes into the lightbulb holder. That allows it to be fitted the wrong way round.
After that, switch numbers 4 and 5, which should be Green/Grey and Brown. So turn the plug around, and switch the wires.
On the left side (Passenger for UK folks) you'll find these wires:
No1: Black & Red
No2: Black & White
No3: Black & Grey
No4: Black & Blue
No5: Brown
and you need to switch numbers one and two around. That's it.
) but are the rear lights on the 6N and 6N2 cars identical??
keep the standard ones they look well better!!!