C 3500 HD Truck 2WD V8-6.5L DSL Turbo VIN F (2001)
C291 (Switch Harness Inline to Dash Harness - 5Y0 and 5X7)
"For a description of the RPO Code(s) shown in this article or any of the images therein, refer to the RPO Code List found at Vehicle/Application ID".
See: Application and ID/RPO Codes
C298 (IP Harness Inline to Crossbody Harness)