Toyota 2003 Tundra Owner's Manual page 181

Type C cup holders are equipped with
a detachable adapter for each holder.
When you remove the adapter, a bigger
cup can be held in the holder.
'03 TUNDRA_U (L/O 0301)
Type D (front side of rear console box)
Type E (rear side of rear console box)
Type F (rear seat)
2003 TUNDRA from Jan. '03 Prod. (OM34421U)
181