English to French Tech/Engineering Automotive / Cars & Trucks Rear spoiler installation instructions

Make a ring from a piece of tape (with the adhesive surface on the outside), and attach it to the template.
Attach the template so that it follows the countour of the front of the rear spoiler and the contour of the **bolt seat**.

Je n'arrive pas à voir ce que désigne "bolt seat" ici, et je n'ai malheureusement pas accès aux illustrations qui accompagnent normalement ces instructions.