[liudichris]

Technically, the US version Yaris has an A/C system different than the CAF-equipped (EU model) version, which is why you won't find one on your vehicle. The different A/C systems have different air flow restriction capabilities, and Toyota engineers determine whether or not it's 100% safe to install from a reliability standpoint. Chances are, you won't have any problems...but this is why you won't see the Yaris on a Cabin Air Filter application chart in a US dealer, although it can be retrofitted.

I wouldn't recommend making your own, because CAF's are specifically designed to allow a certain amount of air flow. A filter not designed for your vehicle, can cause too much restriction...and create potential problems for your A/C motor.

The 87139-52020 is the OE part number for the CAF-equipped Yaris, but there is a service part available. This would be the 87139-YZZ08, which is also an electrostatic (same material) CAF at an MSRP of $25.00.