dont be a fanny! best way is to get some card and make the cut out in the card and check the catches fit, if they do then youve basically got a stencil! fit the bonnet and make sure it all lines up, fit the pins to the cracsh bar 1st, rest the bonnet on the pins and mark the bonnet from underneath. put a small drill bit through from underneath then you have your marks on top.(drill from the top to avoid it buldging) and just keep checking everything constantly!