Welcome! The torque value is in the writeup for the ALH engine, which is the engine that you have on your 2003.
Since there are 3 rollers, I don't know which one you're talking about. Here are all 3:
upper timing belt roller bolt (small): 15 ft-lb
lower timing belt roller nut (small): 16 ft-lb
lower timing belt roller bolt (large): 30 ft-lb +1/4 turn
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