Anyone know what the top ball joint is for the front suspension is?

i need to clean out the threads of the top wishbones, so i need to get a bolt and some locking nuts.

its a 18mm x 1.50

I have got a tap in the garage that I used to clean mine out. Think its the right size will have to check later. can post it this weekend if you wish to borrow it.
Rescued attachment thread.jpg

that would be superb mate...

ill u2u my address.