A used Jaguar XK150 RH front suspension upright or stub axle carrier, Jaguar part number C3009
Not in bad shape for a part that is about 60 years old but you might want to replace the ball pin spigot C2034 which you can get with the morganite socket from DMG for about £33.60 (at the time of listing)
All the threads are good but will need cleaning out as the part gets processed.
This will also fit the XK140 & XK120