Buick does not have a sectioning procedure for the front upper rail.

Check out the General Motors position statement: Collision Sectioning Warning

Buick has a partial replacement at factory seams procedure for the front upper rail. The procedures can be found at www.acdelcotds.com

For short videos that show how to purchase and access the Buick collision repair information, check out the Buick OEM Information page.

A tool that may be used to find out if the vehicle maker has a partial replacement or sectioning procedure is the I-CAR developed OEM Partial Part Replacement Search.