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STEP 1. STEP 2.

Disconnect the light bulbs, leaving the bulbs in the light housing so you don't lose them for future use. Pull your grille off pressing down from the top and pulling up and out on the clips. Your grille should pop right out. There are four bolts per light. Unbolt those bad boys and carefully take out the lights.
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Next, you got to cut out the radiator support on the left side of the radiator (as seen above). There is a seam to follow so just cut along the bend. This is necessary because the light will not fit without this piece being cut away. Cover your paint!!! The metal chips and dust are hot and will burn your finish.
STEP 3. STEP 4.
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Then you have to cut the support for the top outside corner of both lights (as seen above). A small straight cut is all that is needed. Then take a pair of vise-grips and bend them out straight about 10 degrees away from being totally horizontal.
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Then, you need to cut the top inside corner off of the left light. (The side where you cut the radiator support) The above picture is of the back view of the light. You also need to cut the little pegs off of both lights. They are located on the supports of the lights.

Now is a good time to test fit the lights. Make sure they fit without any rubbing or impediments.
STEP 5. STEP 6.

Next, you need to either buy the German wiring harness adaptor from VW Sport USA (25-45$) or make them yourself. Being that I chose the latter, here is how you do it. Go to a stereo shop and buy 8 negative speaker wire connections. The gold kind are the best because they won't corrode if water gets to them. Go buy 4 lengths of 5 foot wire. 22 or 18 gauge thickness is best. Cut each of these in half. Then proceed to connect the connections to one end of each wire.

You should now have 8 lengths of 2 1/2 foot wire with connections on one end of each wire. 4 wires for each light. Label each wire; high, low, ground, and parking. Grab a test light and test the light bulb hookup. Label these with a piece of waterproof tape or some tape you can write on. It should read from left to right on the hookup; high, low, ground.

THIS IS HOW IT WAS ON MY CAR. YOU SHOULD TEST THIS OUT TO MAKE SURE!!!

You now have a choice. Do you want your auxiliary light that came with the MKIV lights to be steady or blink when you turn. Pull out the appropriate light on your car and test for either the turn signal or parking light and then label the wire.

DISCONNECT YOUR BATTERY NOW!!!

With wire strippers, tap into the factory wiring. Connect the appropriate wires and then get ready to connect them to the lights. If you look at the back of the lights, you will see a four prong harness. It should be from top left clockwise; ground, high, parking, low. Check this out to be sure but that is what is was for mine. Connect the wires, making sure they speaker connections aren't touching. I wrapped mine with electrical tape. It should be a tight fit. Don't force the connections. If need be, pry them bigger with the tip of your test light.

After making the connections, double check your connections and wiring. No bare wires? No wires connecting? Are the connections right? Check one more time. Close your eyes and have a fire extinguisher handy and connect your battery. After turning off your car alarm that will go off, check the lights. Driving lights are outside, high beams are inside. Check your turn signals or parking lights. No smoke? Good, the hardest part is over.
STEP 7. STEP 8.

This is when everything gets all jimmy-riggish. You need to make some extensions to make the lights fit correctly. VW SPORT USA makes them and if you ask them nicely, they will make them for you too. Special thanks goes out to them for giving me a set. You can make them by getting thick fuel pump hose and cutting two 1" lengths and 2 half inch lengths.

Each corner of the lights needs different mounting instructions. The top outside mounts need a 1" bolt and nut to connect. Tighten these all the way up. The top inside mounts need a 1" self-tapping screw. It should go like this; screw, washer, light mount, hose, into the car body just below the factory bolt hole. The bottom inside mounts are not used at all. The bottom outside mounts go like this; 1 1/2" bolt, washer, light mount, 1" hose, through the car body hole, washer, nut.

If you mount them right, there will be no gap. The lights actually fit real nice after everything is done right. Phewwwwwwww! That nightmare is over. Take a break and wait until dark. You didn't expect them to be aligned did you?
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At night, you need to adjust the lights so you don't blind people or light up the sidewalks. The lights should overlap about twenty feet from the front of the car. Tightening up the bottom screw will bring the lights up. Tightening the outer mounts spread the lights out. Tightening the inner mounts spreads the lights in.

Lastly, carefully snap your grille back in, being careful not to break off the plastic clips. There you have it! MKIII with MKIV lights!!!
 

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