Now there was i thinking that by putting the part number on the posting , it would make things easier, but not so.
 I need the two tail section peices that go either side of the rear light on an 851 flat side single seat unit (SP2/3 type)
 they are black and either rubber or plastic.
 
 they can be seen clearly in yellow 916's posting about selling his SP3.
 
 hope that helps.
 
 
 cheers
 red...