1x1x2 double -sided with convex brick brick

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Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint Ball Half [Horizontal Top], Rotation Joint Socket #47452

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Brick Special 1 x 2 with Studs on 2 Sides #52107

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Bracket 3 x 2 x 1 1/3 with Pin Bottom #18671-73562

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Brick Special 1 x 1 with Studs on 2 Adjacent Sides #26604