[DeTomaso] Clutch Master rebuild kit???

[Panteratime]

Folks,
1972-L,
Clutch pedal goes to floor and looses pressure.  There are no leaks anywhere.  Drained and bled system at slave.  Still  soft pedal.  Slave is years old but its a stainless long throw unit  from our vendors so I don't suspect a problem.  Master is original. 
I heard it may be bad seals in master when it can loose pressure with no leaks?  
So--What is part number for rebuild kit?   Beck Arnely?   Sources?      
Any other direction/suggestions greatly appreciated!! 
Cliff--NY 
Thanks!!!
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   Folks,

   1972-L,

   Clutch pedal goes to floor and looses pressure.  There are no leaks
   anywhere.  Drained and bled system at slave.  Still  soft pedal.  Slave
   is years old but its a stainless long throw unit  from our vendors so I
   don't suspect a problem.  Master is original.

   I heard it may be bad seals in master when it can loose pressure with
   no leaks?

   So--What is part number for rebuild kit?   Beck Arnely?   Sources?

   Any other direction/suggestions greatly appreciated!!

   Cliff--NY

   Thanks!!!