Is the commentary of the Torah (not the translation) of Saadia Gaon in the original Arabic available online?
maybe this is what you're looking for: https://orajhaemet.files.wordpress.com/2014/02/1.pdf
if you want, here is the complete text , i think there's a parasha missing , but the rest is complete: http://www.orajhaemeth.org/p/blog-page_25.html
His commentary on Beresheet and Shemot in the original Arabic can be found in the Genizah website, in the Judeo-Arabic section. Just make a free account and you can access it.