Mine was out of a Toyota Matrix PN 22030-0D030, which I got from Ebay for $30 including shipping.

I drilled out the rivets and opened up the electronics and swapped with the Yaris' and it worked without any CEL (I don't think swapping out the electronics is necessary though). I ended up putting back the stock TB though when I was hunting for a ghost fault on my Dee Dee, but ended up finding out that the ODBII reader I was using was faulty, and made me buy stuff I didn't need.
I could put it back, but I think I'll just do the throttle pedal swap instead.