Adding ABS to a Yaris

[tadc]

Greetings all - nice forum you have here. Sorry that this isn't exactly a 'performance' thread, but this forum seemed to fit the best.

So - I'm a VW TDI guy(hello high-mileage buddies!), but my wife has an 07 Yaris. When she/we bought the car, they were just appearing at the stealerships and we didn't exactly have a lot of options to shop around. She ended up with a real stripper, with no rear wiper, no radio, and no ABS.

I fixed the radio problem easily enough (although I had to wait for the dash kit to come out), and we live without the wiper, but i'd really love for her to have ABS.

When I looked into the radio question, I was pleased to see that the wiring harness, brackets and even the speakers were factory installed, and all I had to do was supply the deck. This got me to wondering if a similar situation might be the case for the ABS - could it be that the wheel sensors, wiring and what-have-you might be in place on the non-ABS cars, and I might just have to lay my hands on an ABS pump and swap it in?

Has anybody seen wheel sensors on a non-ABS car?

Thanks much for any comments!