Ive noticed that a lot of the ss3 model celicas had side skirts and some with the bumper extesions. Where they fitted from new or is it an after market thing! If they where fitted originally can you order from toyota? Any ideas of price/fitting probs

yes the sideskirts and rear will fit your gt-four, but the front may require some modification. theres a user on here by the name of uzthedentist who has the ss3 lip on his four. as for ordering them, you can probably get them from toyota with the part numbers in hand or you can simply order them from chrisc in the b/s forum.