While investigating fitting the orange clip to the later type in tank petrol fuel filter in my 75 I discovered some info that may be of use. The same type plastic filter/sender assembly was used on the Mini Cooper 2002-2006 (BMW R50/R53) under part numbers 16146757196 also made by Vaico No. V20-0717.
The paper filter comes as a kit with o rings and seals. below is a link to a site which gives an excellent instruction on replacing the paper filter, although it's a mini you will notice the similarity.
http://www.billswebspace.com/MiniR50...erDIYGuide.htm