Factory Five Racing MK4 ROADSTER Assembly Manual page 250

Then fit the larger adapters over them.
Upper radiator hose
Start at the engine and route the tube above the "X" and to the upper radiator hose location.
The inline filler neck goes in the upper hose.
Mark the tube where it needs to be cut so that the tube will just touch the attaching location.
Remove the tube from the vehicle.
Cut the tube using a hack saw or if available a cut-off wheel. If necessary clean the end up with tin snips or a
grinder.
Shake and blow the tube out so that no metal pieces are in the tube.
Reattach the tube assembly to the engine and tighten the hose to the radiator.
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