AOA,
Projector units are available in different forms, I selected the one's used for retrofitting...... no cutting/alterations required. Its H1 type Bi-Xenon Low & Hi beam.
As for the installation, I bought a set of new headlights DIPO @ 8000/- got them opened from the Montgomery road as was not sure to risk the original ones.
Next, assembled the projectors with shroud......the assembled unit simply slips into the bulb hole and then you tighten the check nut provided at the back ........voila.
Here as some pictures taken in the evening. I took out the car at night, Believe me driving is better than with oem lights as the light spreads all over the sides.
Money well spent.