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1993 to 2011 regular cab or extended cab beds are the same size, 6ft, and interchangeable
There were "Long Bed" Rangers, 7ft beds, all regular cab, and no you can't use one, lol, the axles in these long beds were moved back 6", so if you lined up your wheel wells there would be a 6" gap between cab and bed
So you can get a "better" bed and just "bolt it on", if its a 1999 or earlier bed, you may need to swap tail light lens to match your 2003 wiring, I think the lens changed in 2006 but wiring was the same
If you can find a damaged bed you can cut out a section and reweld it into your bed