As we have both an engine oil and auto oil cooler in our radiators (assuming you have an auto) be a bit wary of aftermarket ones. They may restrict oil flow dramatically and cause issues with low oil pressure & flow on both sides as often they just throw any old concentric cooler in there that fits if they are building down to a price. It's not like they need to prove compliance to Land Rover's technical specs or anything...
My 360k+ original factory radiator carked it recently (clagged up and fins starting to rot) and I elected to get it re-cored so that the critical headers and coolers remained factory-spec. Not a cheap option ($660 in Port Pirie, but I was on my way to the Simpson and needed a quick, reliable solution). Aftermarket radiators could be OK, but I have seen a number of references to people having issues with oil pressure after fitting which is a big worry. That could kill your engine or trans or both. Go in with your eyes open and know the risks, is all I am saying.
For under $600 you can get a NOS factory-original 64mm heavy-duty monster (there's s bloke advertising them on here somewhere...). But all of the factory ones run relatively small core tubes so you need to keep your coolant clean and flushed per the schedule or you risk clogging (like mine did).
DiscoClax
'94 D1 3dr Aegean Blue - 300ci stroker RV8, 4HP24 & Compushift, usual bar-work, various APT gear, 235/85 M/Ts, 3deg arms, Detroit lockers, $$$$, etc.
'08 RRS TDV8 Rimini Red - 285/60R18 Falken AT3Ws, Rock slider-steps, APT full under-protection, Mitch Hitch, Tradesman rack, Traxide DBS, Gap IID
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