If I recall, the terrafirma rods use the D1/Defender/RRC tie rod ends, in corresponding LH or RH threads, is that correct?

I'm thinking to replace them with non-greasable ends, as its a fraction of the price, and just carry a spare or two.

 

That is correct

 

Give L8 a call they have by far the best deal on a quality set of (4) LEMFORDER Tie Rod Ends.
And UNLIKE the blue $hitpart box... the Lemforder blue box will put a smile on your face!

(3) RTC5869 and (1) RTC5870
> https://www.ebay.com/itm/LAND-ROVER-...sid=m570.l1313

 

Why 3 of one and 1 of the other? Shouldn't it be 2 of each?

 

Yes, my mistake I forgot that the TF track rod does not have the adjuster rod ( NRC4700 ) like on the OE RRC and DI rod.
Still IMHO LEMFORDER are the tie rods to get.

 

A bit pricey for rod ends, especially being non greasable. Are they really worth it? I can get API or Delphi's for 5-7$/ea

 

Much of Lemforder production is in China as is many LR parts these days, very little is produced in Germany.