I have a '63 Signet. I may have to replace the lower ball joints (haven't checked them, but I did have to do the 4 tie rod ends). My question is: Are they different manual or power steering???
No, and checking the Australian and US factory parts catalogues, I confirm your visual impression that the RHD ones aren't the same as the LHD ones. Uppers are the same, but lowers are not. Send me a PM; I may have a set of those lower balljoints new in box from my last drum brake A-body (which I no longer own) and I have no problem shipping internationally.