where can i find old G Series lock

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Question
Answer
Schlage G Series template locate here.
The G-Series lockset was discontinued in 1981, and all service parts for the G-Series lock were discontinued in 1985. 
 The current interconnect lock, S200 series (available in levers only), will not fit into the same door preparation.
The L Series lock can fit into a door prepped for the SCHLAGE K Series with some additional prep as described here.  
K and L trim and parts are not interchangeable. 
No parts are compatible between the Falcon MA-Series and the obsolete Falcon M-Series.
The old D series lever lock was replaced by the ND lock in September 2003.
The new Falcon T-Series latch, introduced mid-June 2013, will work with all available T lock strike options.  No changes have been made to the strikes.