Hi we had the PIAA's on a previous car, they were superb, didn't buy them, already fitted, think the kits were a £500 option originally.
The P1 spot light's are Hella's and in my opinion don't hold a candle to the PIAA's, however you can get HID Hella's but can't see you buying either for £230
Regarding the brackets, would think if you could buy some PIAA brackets they could be converted to suit your Cibies, may be a dealer job, be prepared to sit down when you hear price
From memory they bolt to the bumper with 3 or 4 bolts behind the light on a square plate, maybe you could make some to fit?