Seems like OEM from my comparison. Has the knocked off edges.
USB Type C Extension Cable USBC 3.1 Sync Data Charger Charging Wire 3Ft
Feb 01, 2020
Good and sturdy cable
Good and sturdy cable
Eibach PRO-KIT Performance Springs (Set of 4 Springs) Part #5536.140
Feb 24, 2017
A must have for NC Miata
These are OEM Mazdaspeed spec, and the same as what you get at the dealer.
The ride quality with the factory Bilstein shocks is excellent. Body control is excellent and progressive. The OEM stock grand sport springs are broken in comparison to these. You need to remove the grand sport springs and consider these to experience what the Miata was designed for.