Had a look at the link, they do squared rather than rounded screens. Much nicer in my opinion and more vintage.
Ok, I confess, my two speeder has squared off ones - Auster screens too.
Had to find out what
Auster screens are as the only Austers that I know of have wings and were used as taildragger training aircraft after their spotter/observation role for the Brown jobs during WWII.
Just incase anyone else is wondering what they look like this is one : -
http://www.ebay.co.uk/itm/Auster-Screens-Any-Pre-War-Car-/180999335003?nma=true&si=JNEf%2BgBEQujkj96npY55yeuazcE%3D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557