1 3/4-16 Threaded filler plug for use in the differential cover on 1927 – 1931 Cadillac and LaSalle.
Cadillac part number 57971, group 2.0041.
Material: Steel
Finish: Natural
Thread: 1 3/4-16
Thread length: .312
Hex: 1.062
Hex height: .500
OD: 2.000
OAL: 1.000
ID: 1.250, .666
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