HELP - Disc Brakes - 75 Dodge Dart Sport Coupe - Caliper Repair Kit

Well, considering where your at, in your profile, i can see why you have to get things by mail order.
That being said, there isn't anything "special" about those calipers, or getting repair kits for them.
Very common caliper, used on a bazillion cars throughout the years.
As the other poster told you, order from Rock Auto.