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Slope Brick
Slope 45° 2 x 1 Double / Inverted with Bottom Tube #3049b-3049-3049a-3049c-3049d-82060
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Round Brick
Brick Round 2 x 2 x 1 2/3 Dome Top [Undetermined Stud] #30151-30151b-26451-30151a-38708
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Shaft Bolt Connection
Technic, Steering Arm 5.5 x 2 with Towball Socket Rounded, Chamfered #57515-64872