Wishbone adjuster nuts

[brainbug007]

Am I right in thinking that the camber adjuster on the wishbones at the back need to have a locking nut of some kind for iva? If so can anyone advise what size it is (I think its something like M18?) and not having the car or book infront of me at work, I can't remember if there's something similar at the front so I'd need 4 nuts in total? I'd like to find em on ebay today to get them before the weekend to fit them while I've got the wheels off to fit my body panels