I've had my PIAA 520's for a few years now and the rivets for the mounting brackets became really loose.
Two replacements later (Thanks PIAA), Here I am.
I ordered a 3000K HID kit with H1 bulbs.
Stock 85 Watt PIAA Halogen.
3000K 35 Watt HID.
Now to get the back of the bulb to fit in the housing and run the wires out of the small hole in the back.
I'm going to try to cut the plastic on the back of the bulb.