Peter, The windscreen chrome surround has standard fitted threaded posts in the correct place to accept the visor screws. You need these for two reasons, 1 to space the visor from the screen surround and 2 so the screws do not contact the edge of the glass within the screen surround. so a tricky one here! People do sell spare windscreens from time to time or try contacting dealers to see if they have any lying around they'd be willing to sell. I have to say I have sun visors and to be frank they are not much use. I hate baseball hats as I look like billy bunter in one but in all honesty I find them to be the best option!
