What is the part number for the extender rings (EXT) shown on the deadbolt IC assembly instructions P515-800?

The Interchangeable Cylinder Assembly deadbolt assembly instructions P515-800, identify the extender rings by "EXT".  Replacement rings can be purchased as a kit, 36-071 which include both the 36-066 finished brass trim ring and the 36-068 hardened steel insert.  
 
 

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