Step 1, Open Parts TM (TM 9-2320-280-24P Vol 1).
Step 2, Hit up the Table of Contents, find that the section I need is 225 (Windshield Assembly, Folddown).
Step 3, Identify part in diagram ( 18 )
Step 4, Reference following parts list to determine P/N / NSN. (PN 12338845, NSN 5340-01-185-7024)...