rszmjt;
There are three seals and two rubber spacers on a 1970 Nova. The repop seals are in the correct shape.
They are installed on the underside of the skirt and the staples commonly go in from the bottom.
You will need to buy another set to make the third piece. It goes on the rear of the driver side skirt. It is shaped like one half of an oval. I can probably dig out the pattern for the third piece.
The rubber seals are about 4 inches long and staple to the skirt on the engine side back rear to keep the skirt from rubbing the sub frame. It is shaped like a squashed U. I am not sure of replacement piece. A 4” x about ¾” by ¼” piece of rubber should work. I will have to add a source for it to my research page.
Greg