Factory Five Racing Mk4 Roadster Assembly Manual page 175

Silicone the chassis where the aluminum floor will touch. The main chassis rails are not riveted to but
still need a bead of silicone run along the tops. The top edge of the tunnel is not riveted yet but gets
silicone as well.
Drill and rivet the floor in place to the chassis. Use a couple clamps or tape to hold the tunnel top to the
tunnel until the silicone sets.
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