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The Bridge Parts are three scraps found in Paper Mario: Sticker Star in Shy Guy Jungle. Mario is required to retrieve them from Spear Guys in different locations: one is right near the steps leading up to the Comet Piece, one is hidden in a garbage depository to the west of the Comet Piece and must be unveiled using the Goat or Vacuum Things, and one is among a group of Spear Guys in some leafage east of the Comet Piece.
Once all three Bridge Parts are obtained, they must be placed onto the empty space near the Comet Piece, allowing access to it.