Identifying 73 and up disc brakes

The could also be F-body spindles with 73-76 A-body upper control arms, but it doesn't matter as they can be used interchangeably, but make sure both spindles are the same height...Also, could be 10.87" rotors or 11.75" using late B-body caliper adapters (doesn't look like those)...No other choices for slider calipers using Mopar parts.