I gather by the lack of replies they are rare however I have sourced 4 clips from a local breakers and whilst there got another grab handle for the drivers position the one which goes on the roof. Hi Range of Wynchnor Staffs they are good for p38 spares if you are in the derby, staffs areas.
BTW the shade will fit from the top with the glass in and wound back and the black clips just go in in situ. so no need to remove sunroof glass if you require to remove your shade panel for recovering.
Nick.