Here's shuttle 8019 now with a real fin instead of the missile launcher as suggested by u/Lordbricktrick and u/mcbaine37. I removed the launcher pieces and pinned the fin in between the technic
8019 Star Wars Republic Attack Shuttle (Retired) (Previously Owned) – Bricks and Minifigs Ontario
LEGO Star Wars: Republic Attack Shuttle (8019) with Mini Figs & Instructions 673419111829 | eBay