The name of the body kit is "CARCEPT" and the images are from around 2000/2001. im not sure if company is still around now, 23 years later, but if you are unable to find them online, there are many other sideskirts available with similar design.
CelicaHobby.com is an independent Toyota Celica enthusiast website. CelicaHobby.com is not sponsored by or affiliated with Toyota Motor Sales, USA, Inc. in any way. The Toyota and Celica names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.