The old part number is 171-0978 which has been superseded by 171-1245. The same OE brake pads however.
AC Delco OE Factory Rear Brake Pads 2001-2007 Classic 2500/3500
AC Delco OE Factory Rear Parking Brake Shoes 01-10. One order is 2 shoes that is enough to do one side only. If doing both sides you need 2 orders (to complete both sides of the parking brake shoes).