So I had new lenses and bulbs put into my 1997 GMC sierra half ton truck. The bolt head for adjusting the aim is a "star" shape head and also has a star hole in the middle of the head for a star key to drop into. I think it is stripped because it slips so I need the socket that will fit this star bolt head so I can grip it and turn it to adjust aiming of the lenses. Anyone know what star socket size this bolt head is? Thank you for the help!!!