Oddly enough three are RH thread and one is LH. So, you'll need three RTC5869 and one RTC5870, try to find the ones that have grease fittings. "Land Rover Toolbox Videos" on YouTube has a tutorial on changing these out.
'99 Disco II
'95 R.R.C. Lwb (Gone...)
'76 Series III Hybrid 109
'70 Rover 3500S