Just go to any local sheet metal shop and get some aluminum sheet. They won't have 2024.....get whatever...its the belly pan, right? If it goes in the wrap areas try 5052 .030 ....it will polish up for you if needed.......the shop will (can) cut it to size for you too. You avoid freight this way too.
"If it can't be reduced, reused, repaired, rebuilt, refurbished, refinished, resold, recycled or composted
then it should be restricted, redesigned or removed from production."