Terrafirma never got back to me, and there seems to be a dearth of information about this on the internet. Spoke with Atlantic British today and can confirm these are the correct part numbers for replacing those tie rod ends/ball joints:

RTC5869: https://www.roverparts.com/steering/...oints/RTC5869/
RTC5870: https://www.roverparts.com/steering/...oints/RTC5870/

Hope this helps a future searcher!

 

Cheers @Brandon318 .
Mine are rusted and the boots are worn on my TF set.

 

have been looking for this for a bit... but never looked past Terra Firma basically ghosting the question / seller on Amazon having Zero Clue!

Thanks
Bought the Set of 4 Via ABs Amazon Store

 

Same as a Defender, Range Rover Classic, or Disco 1, if you're stuck looking for one at a generic parts store