I am very happy to help with this one....
I have just changed my rear pads
Each side of the disc, concentrating on one wheel/side of the car at a time.
There is two calipers each side of the brake disc right.....
First next to the caliper is the silver anti squeel pad(outer edge furthest from brake disk which is sitting in centre) We'll call this 1
Then there is the plastic anti squeel pad. The arrowe must face towards the main direction of travel when going forward (meaning simply, "facing upwards". CAll this 2
This plastic pad sits directly onto the back of the brake pad, then the brake pad slots in touching the brake disc call the brake pad 3
So if it helps
Order as above is from the outer edge of the car nearest to the wheel inwards under the car............ Caliper then, 1 (metal anti squeel), 2, (plastic anti squeel, arrow upwards), then 3 (brake pad), meets one edge of the disk, the is reversed on the inside edge of the desk nearest to underside of the car
1, 2, 3, brake disk, then 3, 2, 1.
All metal and plastic anti squeel have the lip to sit in the round holes on brake pad.
Helps?