If you've got a paypal account, Alex at
www.ducati-kaemna.de can do you a GP500 double bubble screen for about 55 quid including carriage from Germany - they don't have one for early SS's listed on their site but they can get you one in from the manufacturers - took less than a week for me to get mine and very nice it is too. I would attach a picture but unfortunately the bike is round at me ole man's for the next week or so.