I decided to replace the original wiring loom after 50 year with a new one. The risk of catching fire due to broken or uninsulated wire is too high.
After some research I found Autosparks as the best supplier and ordered directly. Take into account the delivery time of 10 weeks.
Here is what I have got, a complete set of both body side looms, an engine compartment loom, the dash loom and the bonnet loom and some smaller parts for here and there.