A brand new ( Lockheed design) 1″ bore brake master cylinder as fitted to the Morris 10 ‘M’ manufactured from 1939 – 1947………..Please note: This master cylinder will not fill earlier Morris 10/4 ‘Pre-series’, Series II or Series III models ………. The equivilent OE Lockheed part number for reference was 28307.
7/16 unf outlet
Over the years its possible your car had an earlier or later M/C fitted, in some cases the only difference was the thread of the output! Its worth checking from the diagram below (extracts from the Lockheed Catalogue) that you are ordering he correct model