Timing Belt Kits

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Mazda Protege5
I have a couple of questions regarding the timing belt on a 2003 P5.

1) How can you tell if the timing belt is original or not? My daughter's P5 has 136K miles on it and I don't know if it's ever been replaced. I just bought the car and the Carfax didn't have any timing belt maintenance listed, though lots of other maintenance items. Is there a part number or manufacturer name on the original belt?

2) If I have to replace it, I'd probably go the kit route (belt, tensioner, & idler). Are there any that are better than others? I usually stick with Dayco, Gates, or Goodyear for these types of things. But, RockAuto has an Airtex kit that includes the water pump for $85.
 
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