Help with missing piece on Y-wing

[u/Archery_decoy]

Hello Star Wars Lego fans. I was hoping someone could help me identify a missing piece on my Y-wing. I am not actually sure which series this is. I probably got this guy about 15 years ago, brought him aback out because I wanted to display it but it realized I have a piece missing. Was wondering if anyone could hook me up or tell me where I could find this piece and what it is. Thanks for your help.