Windows 2008 x86 media

i have 9 HP Proliant DL380 G7 servers in production.  they are quite healthy and stable.  when they arrived approx 7 yrs ago, they came with the OS (Windows Server Std 2008 x86, not R2) already pre-installed.  the units have long outlasted their warranty and i can live with that (we have some decent spares).  however, the issue is i need the Win2008 x86 media as a former support person did not make backup media.  this is just a general question as i begin hunting for ISOs...  does anyone know if HP would grant a request to download their media (i will try)?  and would it exist anywhere else.  i have a valid VLSC login but looks like 2008 32 bit is not available for download.

second question is, would i require the HP branded media?  or would an old retail copy of Windows 2008 x86 work?

turns out the servers perform Windows Backup images to USB daily however i believe i need original Windows 2008 media to attempt a test restore.

thanks.