if you are changing the water pump, which you should when changing the timing belt, you can use a b18c water pump and a b18c timing belt...The Water Pump and the timing belt go together...
You use the b18a/b timing belt with the b18a/b water pump, also known as PR4 or P75...
You use the b18c/1/3/5 timing belt with the b16a/1/2, b18c/1/3/5 water pump, also known as PR3, P72, or P73...
The b16 water pump is the same as all DOHC VTEC B-Series water pumps, but the b16 timing belt can only be used with the b16 engine...
Now if that isn't confusing, I don't know what is...
