Searching For 2005 Toyota Tundra TPMS Sensors For 17 " Wheels

[widebody1]

I just picked up a used 05 Tundra, but it does not have the sensors in the wheels according to the previous owner.

Here is a picture of the wheels on my truck.
http://img179.imageshack.us/img179/3313/wheelsoi3.jpg

What sensor do I need for it? A 20 deg or 40 deg?

[TPMS Guru]

The 20 deg. It was meant for alloy wheels.