Hi Gary,
When I bought mine, I tried a lot of different suppliers, and if you want a "one piece" aeroscreen, Westfield and all Locost ones definitely won't fit because they are too short to fit on the width of a Haynes.
The only one I found that was large enough to fit on the width on a Haynes is the one from the GBS Zero wide body because this car has slightly the same dimensions as our Haynes. So I bought it from Kitspares:
https://www.kitspares.co.uk/index.php?route=product/product&path=43_1&product_id=810&car=43
You can check my photo album about it on Flickr here:
https://www.flickr.com/photos/994983...57663733001991
I ordered it in black and had it painted to the colours of my car (I tried vinyl wrapping, but failed miserably!)
Hope that will help