Cluth Slave thread

[Stwdv]

Hi all me again, at least its progress !!!!
I bought one of these LAND ROVER -DISCOVERY 1 300 TDI SLAVE CLUTCH CYLINDER FTC5072
firstly I guess is it the right one it looks like it ??
And do you know what thread the union is it is a similar dia to the one I have taken off but its not the same thread as it binds after 3-4 turns the old one measures 15/32 or 11.9
Help would be appreciated
Thanks

[Stwdv]

Thanks for all your help got some today 12x1fine and fit so job done