I'm assuming that the 69 and 70 attach the same and the molding is not in the 1969 body assembly manual, the 1970 manual shows 2 ea 55998-S45X 8-18X3/4 pan head Phillips drive stainless screws going up thru the headlight bucket, thru a spacer, to a nutclip in the molding on the ends. The four in the center are 381671-S45X 8-18X3/8 round/washer head Phillips drive stainless screws going down to the deflector without a nut clip.
Just for reference, the 1969 manual is missing 3 pages, N9-105-1, N9-105-3 and N9-105-5, and you can use the 1970 body manual pages N0-105-1 almost without change, and N0-105-3 and N0-105-5 are similar (4 vs 2 headlights).
Jim