There are four of them for each mount. They are the ones with the "+1/4 turn" in the torque spec here:
Volkswagen Workshop Manuals > Golf L4-2.0L (AEG) (1999) > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Adjustments > Page 2280
You can get the part numbers here:
VOLKSWAGEN BEETLE [BE] (USA) 1998: ENGINE: 19920. MOUNTING PARTS FOR ENGINE AND; TRANSMISSION
Volkswagen Workshop Manuals > Golf L4-2.0L (AEG) (1999) > Engine, Cooling and Exhaust > Engine > Drive Belts, Mounts, Brackets and Accessories > Engine Mount > Component Information > Adjustments > Page 2280
You can get the part numbers here:
VOLKSWAGEN BEETLE [BE] (USA) 1998: ENGINE: 19920. MOUNTING PARTS FOR ENGINE AND; TRANSMISSION