Bomex is genuine. It is built from high quality, light weight fiberglass. Other kits with the same aero design style or similar name are likely going to fall in to "knock-off" territory. genuine Bomex parts have a perfect fitment. Knock-off parts are likely to not have these same high quality as the original.
The FULL Bomex Body Kit consists of FOUR pieces; 1x front bumper, L/R sides, rear bumper. The Bomex side-mirrors can be purchased separately. The Bomex hood scoop can also be purchased separately but it is very difficult to find anyone selling it outside of Japan - contact Bomex directly for this. I am not sure about the Bomex wing, but the APR Performance GTC-200 Adjustable Wing flows nicely with this full kit.
Review photos...
https://celicahobby.com/gallery/index.php/category/kit-bomex/Bomex Body Kit photos...
https://celicahobby.com/gallery/qsearch.php?q=BOMEXBomex also sells a matching set of side mirrors for the 7th gen celica...
https://celicahobby.com/gallery/index.php/category/kit-bomex-mirrors