Can I slipstream SBS R1 into R2

I have a dell that came with Windows SBS Standard 2003 R2. I need to do a reinstall, but don't have the original disk, but have R1 disks. Of course the microsoft license algorithm is different so my license key doesn't work. Is there any way I can get the R2 files and slipstream them in and burn a pseudo R2 disk?
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Dell should be able to ship you SBS 2003 R2 media if you bought the OS from them along with the server (which you certainly did if it was pre-installed).  They can't give you another license key, but media should be no problem.
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