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the pump you get may be EITHER shapes
but check first as some used typical Holden or Ford pedal assemblies and there is no way knowing what a converted car has without looking at it etc
Fronts only or front and rear are available
If you want to check the GM # it is 3938615 GM NOS
Master Cylinder: 67-72 GM w/ Drum Front (NEW) - 1" bore (25.4mm) (READ DESCRIPTION) the pump you get mayAftermark remake of the early DRUM DRUM front & rear. NOTE this has the single bolt type lid This has a deep hole in the master cylinder piston.. other suppliers may not tell you this but you need to be sure you have the same.. or have an extension on the pedal push rod or power booster If unsure.. you DON'T have to normally take off the master completely just unbolt from the booster . keep the lines in place.. don't touch them hopefully.. just unbolt