The connectors for the rear indicators and number plate light are the round brass 'bullet' type. (Blue Size)
I found that they were not very well insulated so I would suggest that you wrap them with self-amalgamating tape then insulating tape after you have finished working on them. I have also fabricated a plastic cover to sheild the connectors and cables from the spray off the rear wheel.
Oh, and you may find that you don't need the LED resisters as my LED indicators worked fine and flashed at the correct rate without them.