no need to replace the wire harness, use the old one.
are you buying all the parts in the drawing ?? no need to, some parts can be reused such as the bezel #5, 11, 29, and obviously the the bolts #37
for the gaskets, somepeople also replace the round gaskets #30
last, for a complete 02, you need the center taillamp.
Jin,
You mean 6,12,4,40?
About the bulbs, thought we do have 2 each side(?) both illuminate when light switched on. But only 1 illuminate when brake depress.
Did you replace the harness?