Here we have Bathroom mortice locks cheapest on ebay for 76mm locks

They are for fitting with a bathroom thumb turn and release to match the door handles selected. The bathroom locks are available in two standard sizes OF 2 1/2 AND 3 INCH both of which have bolt through fixing holes and latch mechanism for the door handles to operate.

Bathroom Mortice Lock

Modern Design Bathroom Lock

To be used with a Bathroom Thumb Turn & Release

Brushed Nickel Chrome Finish with Black Casing

Bolt Through Fixing Holes to Suit Door Handles on Rose

8mm Handle Spindle Hole (Standard UK Size)

5mm Thumb Turn Spindle Hole (Standard UK Size)

Reversible Locking Mechanism. Instructions included.