The photo is of the same year. The one you get will need cleaning. Pictured is one of the pins. There are two pins
Fit 1955 hydramatic Cadillacs only.
The diameter is 14 5/8inches. It has 176 teeth. There are 30, 3/8th Non-threaded holes to connect the torus. The center hole is 3 3/16 inches in diameter.
Some people refer to this part as a flexplate, Cadillac master parts book refers to it as a Flywheel.
GR 0.666 + GR (8.0931)