See below for the different latches and backsets with their respective faceplate size.
Spring latch
2-3/4" - Square corner, 1-1/8" x 2-1/4"
3 -3/4" - Square corner, 1-1/8" x 2-1/4"
Dead latch
2-3/8" - Square corner, 1-1/8" x 2-1/4"
2-3/8" - Square corner, 1" x 2-1/4"
2-3/4" - Square corner, 1-1/8" x 2-1/4"
2-3/4" - Anti-friction Fire Door Latch 1" Square corner, 1-1/8" x 2-1/4", 3/4" Throw
3-3/4" - Square corner, 1-1/8" x 2-1/4"
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