Part Type: HVAC Heater Core. Aluminum Heater Core. Heater Core. 2003 GMC Sierra 1500 RPO Code D07; w/ Custom Center Console; w/ Rear Vents In Center Console;. Style: Aluminum Heater Core. 2004 GMC Sierra 1500 RPO Code D07; w/ Custom Center Console; w/ Rear Vents In Center Console;.
