3200?

You have a 3805, 1 ton Panel

And, there was a 3105, 1/2 ton Panel

The 1/2 ton and 1 ton bumpers are different, but the rear filler panel should be the same. Maybe someone with a 3805 will post a confirmation or correction.

No one makes a metal rear filler panel, bit some vendors used to sell a fiberglass panel. A rubber seal for between the rear filler panel and the rear bumper used a to be sold by Jim Carter and/or Classic Parts.

The panel-body rear filler panel was the same from 47-55.

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.