Manual disc brakes vs power disc brakes questions

It looks like the 1&1/8 is 1979 dodge truck.

1&1/32" or 1.0313 is 79 volare, 1980 mirada

What does the 15/16" diameter one come off of ?

Based on the chart that 72bluNblu provided, the pickup master may be a bit much at 1&1/8" bore for its 3&1/8" diameter caliper pistons, however the mirada, volare one at 1.03" diameter bore with 2.75" piston calipers will prob work better with manual or power.

Also are the fittings on these aluminum wonders metric or SAE?