HELP!!! how to install Mac OS Snow Leopard to my new MAC PRO

pls. me have new mac pro xeon 64 bit workstation built-in mac os lion want downgrade os earlier mac os, should do???

thank in advance...

 

do have access other intel macs firewire, came snow leopard or leopard or tiger?
since current mac pros came special build of 10.6.4, can't use mac os x 10.6 snow leopard upgrade/retail dvd them, have 10.6.3 on them.

 

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