Early Drum Brake shallow piston style GM brake master cylinder for 1967 thru 72 GM cars listed below with DRUM FRONT.
Master cylinder LID.. may be either style shown here
Bore is 1" / 25.4mm
SHALLOW PISTON
Fits
- 67-72 LeMans / GTO
- 68-69 Firebird
- 67-72 Cutlass / 442
- 67-72 Buick Skylarks & GS
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.jpg "Valance Panel: 67 Firebird")