door handle/catch fitting on rear door (4 door saloon)

[singleton]

Hello all, just wanted to ask for some advice. im refitting up a rear door from a 4 door saloon, it has the interior door handle and door latch fitted but needs the external handle fitting, does the external handle have to attach to the latch with a pin or anything or has it just got a tab or something that flicks the catch mechanism? any advise would be great