- 20577: Curve 1/30 grad (6 pieces = 180 grad)
- 20571: Curve 1/60 grad (3 pieces = 180 grad)
- 20572: Curve 2/30 grad (6 pieces = 180 grad, for 4-lane extension)
- 20573: Curve 3/30 grad (6 pieces = 180 grad, for 6-lane extension)
- 20578: Curve 4/15 grad (12 pieces = 180 grad, for 8-lane extension)
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