replacement for schlage apollo

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While they are both mortise locks they are not interchangeable.  You would NOT be able to use a L9000 with a VD panic device. You would NOT be able to use a VD 7500 with Schlage lev...
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.