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usually your manual can tell you or call the dealer parts department and just ask what size the bolt is they can tell you for sure and its free. usually i seen them be M6 or M8
sounds like your oil pan gasket or valve cover gasket need to be replaced. you will have to take it to a shop or if you have a friend who know what hes doing with the right tools can do it for you.
check the bulb. usually it has 2 coils spring conductor things inside one for low beam one for high. if both look black or broken then thats your problem. try to put bulb in with out touching the bulb itself with fingers. if only high beams work and you only see one coil burned out you still have to replace the bulb. make sure you put a tad of vaseline or bulb grease to seal the connectors so no water can infiltrate cause that kills bulbs. if bulb looks fine then it most likely will be a wiring problem. you can visually check the wires if they have cuts or looks burnt the the wires will have to be replaced. Also Follow the ground wire from the headlight socket to where it connects to metal ground. Disconnect the connection, sand it with sandpaper. Then apply a dab of dielectric grease (any auto parts store). Then reconnect. That should solve your problem.