Your in luck...sort of.
I do have one, c/w the threaded adjuster bit & a nut (+a spare nut) but I do not have the castle nut.
It's a bit beaten up & is a bit corroded esp at the nut end but should clean up.
The thread at the nut end is a bit chewed up & the nut wont go on atm but re cut the thread & it should be ok.
As it's a bit beaten up I'll send it to you FOC, if you can use it great,

if it's no good bin it.
PM me your addy & I'll get it posted asap.
Mac & Franks Spares Emporium. A sub division of Mac & Franks Acme Industries International Corp.
Making up since 2007, sometimes it's true...Honest...