here's more than you asked but what you need to know:
1-see link below. download it and print out. invaluable for what you'll be doing.
2-your 2003 has "one-year-only" pulleys and belt. be sure to purchase the correct length and width belt.
3-OEM stock belt part # for 72/30 original issue pulley combo and 2003 only is---G0500.02A8R
4-REAR AXLE: lightly coat and i mean LIGHTLY coat rear axle with grease prior to reassembly. prevents corrosion. LIGHTLY coat threads with anti-seize prior to installation and "hand-start" axle during reassembly otherwise excellent chance of cross-threading both axle and swingarm threads. believe me....it's been done and done alot.
5-rear axle: initially tighten to 40 ft.lbs torque.....loosen 2 turns....then tighten to 48-52ft. lbs of torque. i use 50.
6-rear axle pinch bolt tighten to 40 ft.lbs torque.
HERE YA GO
http://www.gigaboogie.com/buell/manu...ice-Manual.pdf