I have a stock bin that I'm using. it's for a 1mb pcm (12586243 is the pcm I'm using with 12587603 OS) - The bin is completely stock from GM TIS website. Flashed it to PCM then saved .bin to my hard drive using PCM Hammer. It's for a 04 CHEVY EXPRESS 3500, 6.0, DBC, 4L80E. VIN #1GNHG39U941126032. It will run the electric fans.