Identifying 73 and up disc brakes

Jim Lusk said

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.

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From the look of the pic, they are the 10.87" rotors as the dust shields stick out past the rotors. The 11.75" rotors are even with the dust shield edges. Mopar used the same dust shields on both, and all the way up to 1989.

78-79 B and C body caliper pistons are 2.75" diameter and the casting is the exact same as the A body casting including banjo fitting location making for a nice stopping upgrade. The only difference is the piston size A body is smaller at 2.60" diameter. Some B body cars came with pin type calipers but by at least 1978 they were all slider calipers including pickups and vans.