25 Circuit - Pro Series - GM Keyed Column – Bulkhead Firewall Pass-Through P/N 10413. Painless Performance Part Number: 10413. Part Number: 10413. Once you’ve got the harness fit how you like it, included are over 25 GM factory style connectors found on most ‘60s to early ‘90s GM switches, allowing you to turn the Pro Series harness into a direct fit harness for your application.
