How to mount Alpine PDX-F4 amp and where to find service manual

I just picked up an Alpine PDX-F4 amp in very nice cosmetic condition but it did not come with any mounting hardware and I assume those parts are no longer available. I opened the amp up to see of there were any mounting bosses under the bottom plate but found none. Does anyone know how these were originally mounted? Any suggestions on how to mount one now? I am sure i can figure out something but if there is a known solution, that will certianly make this easier.
 
Photos?

Attached is a PDX-F6.
 

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