What is the recommended bar for the stihl 08S?

I'VE OWNED A STIHL 08S FOR MANY YEARS, REPLACED SEVERAL PARTS, HAVE PARTS LIST, SERVICE MANUAL, ETC. IF YOU ARE RUNNING THE 7 TOOTH 0.404"(COUNT THE TEETH) THERE ARE 2 BAR TYPES (1) DUROMATIC 3002-000-9223 (46RS72E) HARD NOSE 68 DRIVE LINKS. AROUND $100.00 BUCKS. (2) ROLLOMATIC E SUPER 3002-000-9723 (46RS68E) REPLACEABLE SPROKET NOSE. REPLACEMENT NO.(3003-650-2538). HOPE THIS HELPS!