Question concerning fit of front brake rotors

Sorry..I do usually say what I am working on because I have a lot to learn...and what I do know, I sometimes forget due to the length of my rebuild.

The car is a '75 Duster and I believe the vehicle we got the disk brake hub was a '71 Dart.

We bought a new routers, calipers, etc.. The upper ball joint stayed the same size but we are now LBP.

I am new to American cars ...I used to do British ones before my accident.

I seem to live in an island of chebbies and fords so I cannot visit someone to look at their setup.

I have the Chrysler service manual as well as a Haynes.

It helps if I can visualize something before I try to build it...and trying to ahead of the parts curve because it usually takes me 3 weeks to get a part.

I have been looking for expanded views of the disk brake setup...what I am having a hard time with is how the caliper is held on to the overall unit and b) do I need to buy more parts. Oh, I also have the "disk brake" kit from UAP which is a package of all the little consumable parts.

thanks, Ian.