i contacted saleen and they said -

Todd,
We did not keep records of when the truck went through the line only a total of:
2008 : 844
2007 : 566

hope this helps

Jeff Clark
MJ Acquisitions.
Brand Manager
Ph# 949- 836-6795
Fax 877-883-8985

Ford is useless for any info !
I have no idea why they didn't keep track of any production numbers or even a record of the total numbers of the HD's made?

But if you do a vin# search, through Ford, all the trucks that had the S/C added "per say" at the factory were shipped to Dearborn MI, as their ship to location. That so far is the only indication of it being "factory installed", other then the original window sticker.
As I have heard of dealers adding the S/C after, on request.