Identifying 73 and up disc brakes

So if that were the only 2 choices, we'd be golden, but there are all sorts of threads here showing folks how to use various disc brake set ups on A-bodies (different body lines, more modern Mopar disc set ups). I'm trying to confirm positively that's what a previous owner installed...

You've been told what they are. What's the problem? If you don't want them, throw them in the frikkin trash can.