I have a 2003 480 Sedan Bridge,...

[Capt_Rick]

I have a 2003 480 Sedan Bridge, does anyone know where to get the parts for the sliding door? Wheels, etc.

[Airwaves]

Try these guys - https://www.fpmarine.com/Door-Track-s/783.htm

[wingless]

There are three different height trucks.

Measure and match the height of the existing trucks.

FWIW, my door uses tow height trucks.