Generally
The sealing washer in copper, the location is under the nuts that hold the diff block. This is a newly manufactured tile in almost exact original design. Cadillac spare part number is 1456254. Copper washer dimensions are Inside 10.1mm. Outside 17.9mm and the thickness is 1.5mm, so a perfect tile both in terms of size, appearance and function for an original renovation. 14 tiles are required for 1 car.
