yes it is actually easier than going the other other way around. the US and JDM tail lights have the exact same bolt pattern. the difference is the number of bulbs... JDM 4, USDM 3. they have the same reverse light (1156) and parking/brake (dual filament 1157 US) but the parking / signal (1157 US) is split into 2 bulbs on the JDM's. basically, to install USDM tail lights on the JDM wiring, you would just have to get a double filament socket (1157) and wire it to the positive parking filament (dim) and the postive signal filament (bright) then ground the socket. the new socket and bulb would sit behind the outer most lens.
if you are planning on trading lights w/ someonw abroad, you may want to trade harness from the main plug back so that it is easier for both of you to install as the bulbs are not the same size on the US and JDM tails.
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