Microsoft SBS 2003 STD R2 ISO required

Hi We are rebuilding a customer server and he doesn't have the Windows CD nor can we download it. The server is licensed by OEM and we just need the ISO to repair \ rebuild the server. We will use our own OEM key, so don’t need hacked or copyright software. We used to have dozens of these disks in the Action Pack but binned them all! OEM sticker says it is - Microsoft SBS 2003 STD R2 ISO Thanks