* Specific Transmission Type: The Eldorado in 1996 likely had either a 4T60-E or 4T80-E automatic transmission. These have different bolt configurations.
* Bellhousing Bolts: The number of bolts attaching the transmission to the engine (bellhousing bolts) will differ between transmissions and even possibly between slight variations of the same transmission.
* Other Mounting Bolts: There might be additional bolts securing the transmission to the chassis or torque converter.
To know the exact number, you must consult a repair manual specific to a 1996 Cadillac Eldorado with the correct transmission type. A Haynes or Chilton manual would be a good starting point. Trying to remove the transmission without this information could lead to damage or injury.