OEM Aprilia LH Rear/RH Front Turn Indicator (Euro Market Version) - 2D000138 For RS660, RSV4, Tuono 660, Tuono V4 *See detailed fitment list*
OEM Aprilia LH Rear/RH Front Turn Indicator (Euro Market Version) - 2D000138
The Aprilia Spare Parts catalog is rife with errors regarding this part, but it is stock on European models only.
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Complete fitment list at bottom of this page.
Size comparison of European 2D000137 / 2D000138 vs US 2D000573 / 2D000574 are seen in this image and this image. Yes, you can mount the Euro signal in place of the US signal and vice versa. Connectors, hardware and footprint are identical.