1957 master cylinder fill

I know this is a stupid question, but I got a new m/c and I cant see where you add the fluid. Anyone know, I know this is going to be a nightmare bleeding this set up:argue:
 
Is there a filler somewhere higher up on the firewall that gets plumbed to the master? '54 and '55 at least had a filler on drivers side firewall and line running down to the master under the floor.
 
Here's a pic of what the filler might look like, I'll take a look at my Superior later today.
 

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on my '54 and '55s that filler is bolted to the firewall and goes down to the master that is mounted to the frame under the floor. I'll take a look at the '57 in a couple of hours and report back. This is one in a '54 circled in blue
 

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Yes, heres mine I found it laying on its side in engine compartment. I didnt know what it was. So I dont need to fill the master? :argueing:
 

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Drivers side firewall, but filler is on passenger side of booster
 

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Optional. So we ve determined that that is the m/c fill up tube I jusy need to connect it somewhere. Im redoing the brakes. New m/c, wheel cylinders, brake lines
 
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