When should I replace the timing belt and water pump?

It's due at 105,000 miles. Replace ALL the timing components, not just the belt and water pump, but the idler pulley and tensioner, cam-crank seals too. Beside the timing belt the spark plugs are also due at 105K. Zee

If i was you i would replace them by know get spark plugs,valve cover gasket with garments,timing belt,water pump and cam seal crank seal !