lock can be re-keyed by a locksmith. They can take the individual tumblers out of a cyl and move them around to match an existing key. Have had it done several times.
I have some extras. How many do you need? Need the pins with them too? You can rekey them by moving the pins around/matching the pins to what you have now.
Thank you both for the response,
That's exactly what I ended up doing, I had some spare locks laying around (couple of rust free tailgates I'm hoarding), so I was able to remove tumblers, and after some puzzling, I got all of them matched up.
Also took the opportunity to remove all the tumblers out of every lock, and clean/ grease them, so everything operates very smoothly.
Sure is nice to have all matching locks, with 2 original Range Rover steel keys cut (Ace hardware will cut the steel ones, while even professional locksmiths here refused to cut steel keys)
I did end up ordering 2 kits for GM lock tumblers, and they were all slightly different and didn't work with the RRC locks. To be fair, I stopped looking after I cannibalized 2 other locks. So the correct tumblers are probably out there, just didn't look hard enough. The kits did come with the springs which I all replaced.