Rear Brake Backing Plate ID

While restoring the rear brakes on 'the53' I found it necessary to remove the rear brake backing plates in order to remove the rear wheel cylinders.  While cleaning the backing plates I came across the stamped part numbers identifying the left and right sides.  In the attached image you can see the IDs: 30817/2RH and 31814/2LH.

 

 

Also in the53 folder