Door latch confusion

Looks like the doors are the same, although at some point a long time ago someone swapped a lot of the interior for '72 Duster stuff (door panels and center console) so it wouldn't have surprised me. Here's the latch - I'm probably going to give it a chem-dip bath if there's nothing in there that would be ruined by it. Are the thick Z shaped bars still manufactured?
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BTW, for the photos I just used my small iPhone (an iphone 5, not those huge things they make today) to slide it into the inside of the door pointed at the latch. MY door panels are off, so it wasn't too bad.