When I had to re-fix the metal scuttle grille on my 90' 745 a couple of years ago (after about a year of holding it up with fuse wire!!) I used spots of 'Sugru' mouldable glue around the inner edge. I bought it discounted online from 'My Memory'. The grille is still in place.
I have used the stuff elsewhere and found it excellent. This coming Summer I am going to see how it goes on filling a couple of small age related 'heat splits' on the top of the dash.
Bob
