From The Anvil Brass Heavy Duty Tubular Latch

This tubular latch is available in 4 sizes and is especially designed for unsprung door furniture

90129 (18492) 2.5 inches  Backset 1 3/4″ (44mm)
90130 (18493) 3 inches Backset 2 1/8″ (56mm)
90131 (18494) 4 inches Backset 3 1/4″ (81mm)
90135 (18495) 5 inches  Backset 4 1/8″ (106mm)

91104 (18366) rebate kit (for use on double doors where one door closes against the other) – sold separately