i have a 96 k2500 Chevy. i know there's 2 5mm studs coming up from the head lights and 2 what looks like t25 torx studs down in the lights more and i assume they aim the lights. i just want to know witch one does what. i turned the 2 5 mm atuds and it dint seam to do anything for the hi or low beams. thanks for the help.