Compnine Website
http://compnine.com
I noticed this posted on the SilveradoSS.com website and it is very interesting. You can do a VIN search on your truck or car and it will tell you your RPO codes and give you production numbers as well. For instance I found out that there are only 5 trucks like mine built as 2006 models that have the same RPO codes. Another plus is that this site contains vehicle diagrams where you can even get the GM part numbers. I don't know if this site has been posted before but it is definately one I will add to my favorites file for future reference and will definately be a help to somebody new to the game.
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