I beat you to it Paul , but now I want to know too lol
I never noticed before but mine are diffrent !
one is at 5mm and the other 3mm , I am guessing there must be a bit of movement in the holes ,
So will try and sort mine out , try and go with around 4mm
Mine are factory wings , as are the head light rims , notice the rivet that holds a small plate on the inside , chrome is still good close to 60 years on , just worn off a little on the rivet
A good tip , the clip that holds the red indicator lens for the side light , tie a bit of sea fishing line around it , then if you need to remove it , you just pull on the line !