These are for 8mm holes, but are versatile to use in some that are wider. Some Subaru will have 8, some will have 10mm. 8mm are more common, but you need to verify the panel you are installing on before purchasing. 8mm is close to 5/16"
Fender Splash Shields - Plastic Splash Guard Material - Free
Car Parts - Page 1 - TBW Performance
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Fender Splash Shields - Plastic Splash Guard Material - Free
Infiniti G35 Aluminum Splash Shields
Car Parts - INFINITI - M35X - Exterior - TBW Performance
Infiniti Q50 Performance Parts
NISSAN