You want to be a little bit careful with LED's on these cars.
On the 2002, the high-mount stop light LED's are fine - but using LED taillight bulbs makes the cruise control stop working (which is why you need the load resistors that you mentioned.)
Also - you are confusing auto-leveling with the high-beam indicator. The leveling parts that you mention are probably for European versions of the bulb assembly. The high-low is done by a shield which blocks the top of the bulb and is pulled up by a solenoid when high beams are selected.