Australian 1977-1979 120Y Brake Master with the Rectangle Reservoir.
Part Number P7217
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120Y used the same parts as Japan, except for locally assembled cars.
PBR master cylinder in Australia-assembled car
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PBR brakes vs Japan 120Y brakes 
 
PBR master & booster for 120Y
 
Datsun (Japan) brakes have same 4-bolt mount and same length into the firewall
 

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