For the first question, I didn't use the Scion mudguards on my BRZ - although they should fit fine. Instead I went with the Rally Armor mudflaps and I think they look a lot cooler and protect a lot better than the OEM ones.
Pic installed on my car (I have a DGM/Asphalt car and I went with the dark gray lettering on black flaps):
These offer an incredible amount of protection. After a drive in the rain the front of the flaps are absolutely COVERED in road grime and leaves - grime that would otherwise be on the side of the car.
For your second question, if you're on Android you can use the Tapatalk forum app and just search for FT86Club.