Chinese brake drum issue???? HELP!

Which car are you ordering drums for? Since it is a LBP drum you are looking for I hope you have discs on the front. There are 3 different drums listed. One for 9" drums front and rear, another for 10" drums front and rear and the third for 10" drums in the rear with front disc brakes. The drum you posted is for a car with 4 wheel 10" drums. The drum for a front disc brake car doesn't have the lip in the center. Try rockauto.com or the store of your choice using a '73 Dart Sport for reference. FWIW all the 10" LBP (4 1/2") brakes I've ever seen were 10X2 1/2". Hope this helps.