You can look here : https://www.ipdb.org/machine.cgi?id=2446
There are pictures of the playfield.
You should be able to get 90% of the layout from the pictures.
This site also has the schematic and manual.
The manual on page 8 shows the rubber sizes and their related post positions.
https://www.ipdb.org/files/2446/Williams_1972_Super_Star_Manual.pdf
Usually the apron and arch take the same screw size. I count the holes and find the match number of screws.