Originally Posted By: moribundman
Water pump, belt tensioner, idle roller, and thermostat are part of the proper timing belt replacement procedure on a VW. The belt does not have to break in order to make the piston kiss the valves. That will happen if the belt just skips a few teeth, for example when the WP or the tensioner go bad.
There may be a few single-use bolts which should also be replaced. I'd also ask if any of the roller-idlers ever cause a problem -- but not at the VW dealership, the OP might want to skip the dealership and go directly to the independent VW shop.
I would replace everything now and not wait for trouble to pop up. The newer timing belts are Kevlar, but back in 1999 they were not.