Here is a link for some yaris mud flaps, they fit well in the front but the rears need some trimming to fit. There is a thread in here somewhere that shows how ot do it. Accessories FIT FOR 2006~2011 TOYOTA YARIS HATCH MUD FLAP FLAPS SPLASH GUARDS MUDGUARD HATCHBACK-in Mudguards from Automobiles & Motorcycles on Aliexpress.com | Alibaba Group
I don't think they exist for the C, I started a thread about some that I had found and put on my C with install instructions.