M4 x 10mm self-tapping machine screws need to be used with this lock as the screw holes are unthreaded.
This latch-only gearbox is single spindle (92mm PZ) with a 35mm backset. It measures 233mm high by the backset and 20mm wide. The latch measures 20mm high.
Please note that some older locks feature an offset or cranked connector. This is only an issue when replacing a gearbox, rather than a full length lock, but it's an important point to consider. Replacement gearboxes are now only available with inline connectors. They are still compatible with older locks but it will be necessary to adapt the drive gear that runs behind the faceplate.