Phew, yes, these LED swaps take time, money and a lot of patience....as I said on the other write-ups, my buddy MacADaYear is doing the window control LED swap as we both did this together and can answer questions as our knowledge permits 
Here goes....
1)Remove the headlamp control box from truck by unclipping it (pain in da ass), you have to take off the dash piece first of course.
2)Remove the piece of plastic covering the back inside part to get access to the bulb
3)Remove the bulb by twisting that little circular piece with a small screwdriver and pulling it out. You might have to wiggle it around a bit because it doesn't come out easily. I supposed the threads on that little "tube" get stuck in the threading of the housing.
4)The bulb is attached to this little "tube" thing that has 2 holes which each bulb lead(wire) runs through. Remove the stock bulb.
5) Cut the tube as close to the base as possible but do NOT cut off the threads or the tube thing will not twist back in place and stay (a no brainer )
6)Take your LEDs (with resistor) and thread the leads back in like the stock was.
7)Put box back together and put back in truck....
And there you go! 
It's that simple 
As you can see there is a hot spot on the circle "O" part of the headlamp controls. There is a plastic piece that acts like a fiber optic to spread the light around to the other parts. The LED is facing directly at the "O" part which is why that part is so bright. I left it like that because I was tired of taking it apart over and over to move the LED to get the best output. If I can find a way to make all the parts as bright as the "O", I'll let you guys know...but for now you can brag about being the only one with an entirely blue/red/green/etc. interior 
Good luck and enjoy!
'01 Sierra 4.8 SCSB
4.10, Eaton posi, Nelson tune, 160 t-stat, K&N Intake, Magnaflow catback, Vig 3200, Transgo+billets, 100 NX wet shot
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