OS 12587603 for a 2004 Silverado with a 5.3(LM7) setup for a manual transmission. If you plan to run flex fuel then you would want an L59 engine segment rather then the LM7. You will need to readjust things related to the speedometer such as the VSS PPM as they are still configured for an auto trans.
The engine segment is for a stock engine as far as I'm aware and still has all emissions enabled as well as torq management and is configured for a DBW throttle.