Just returned from an 80 mile trip on my recently acquired bike having fitted a new screen yesterday. It is very effective indeed, better than expected to be honest. I can now sit at 70mph with no wind on my chest or helmet buffeting.
This is the itemhttps://www.ebay.co.uk/itm/352845718463?hash=item52273e63bf:g:8NsAAOSwDOFhl2TR
There are no instructions with it but if you have a bit of common sense it is pretty simple apart from the fact that the ‘arms’ that attach via the longer bolts to the handlebars and top yoke have to be manually adjusted, i.e. bent, to get them to fit. The cylindrical spacers are not quite long enough and for obvious reasons you need to make absolutely sure you tighten these bolts sufficiently so they do their previous job correctly. This action slightly distorts the arms. You then attach the brackets to the screen (small plastic washer on outside, large rubber washer on inside). Finally you bolt the screen brackets to the arms. This requires the arms to bend inwards. I opted to have the screen brackets outside of the arms, unlike on the photo on ebay, as it means you don’t need to bend the arms quite as much and it does not affect anything. Due to the proximity of the two bolts you will need an open ended spanner for the second one as a socket will not fit.
It is probably not strictly necessary but I stuck a small piece of foam to the bottom of the screen on the inside incase the wind pressure pushed it against the black plastic headlight shroud.