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What is the Part Number and availability for the Spindle and Spring for CO Locks?

You need to order Door Thickness Kits to get those parts.

For CO Cylindrical locks, the PNs are;
23599376-138 1-3/8" Door Thickness Kit 
23599376-112 1-1/2" Door Thickness Kit 
23599376-158 1-5/8" Door Thickness Kit 
23599376-XXX (with XXX being door thickness 1 3/4" to 2 3/4")

For CO Mortise locks, the PNs are:
23599384-138 1-3/8" Door Thickness Kit 
23599384-112 1-1/2" Door Thickness Kit 
23599384-158 1-5/8" Door Thickness Kit 
23599384-XXX (with XXX being door thickness 1 3/4" to 2 3/4")

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