The build SVT # (if that's what you're talking about) comes from SVT. It's not documented on the truck anywhere.
You have to call SVT or write them to get this info.
If you wanna call them call 1-800-367-3788
This info used to be free, but there is a charge now..
Info is Free over the phone last i called.
Cost 40 bucks to get a build certificate