I couldn't price that by the job, generic harnesses rarely go as expected and need a bit of work. there are companies in the UK that makes a full harness for these with all the correct color codes and mounting clips even LHD models. Personally I would go this route especially if its a restoration.
Just a couple of examples but there are dozens, getting them to the USA is no problem.
Land Rover Series II, IIA, & III Wiring Harnesses, Cables, & Connectors
www.roversnorth.com
Land Rover Series 2 Main Wiring Harness
www.britishwiring.com
Harnesses & Cables in Series > Series 2 > Parts > Electrical > Harnesses & Cables from John Craddock Ltd
www.johncraddockltd.co.uk