Disc Brakes question

Nick Morganelli said

I am converting to Disc Brakes for 1972 Dodge Dart , it has 9 inch Brake drums and the Disc Brakes supplier tells me i have to install 10 inch Spindles, my question is , do i have to replace the Upper Control Arms and Lower Ball joints when i install the 10 inch spindles ???

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Nick Morganelli said

Installing SSBC kit, and states must have 10 inch Drum Spindles, i have 9 inch drums

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It depends, because there are two different spindles for the 10” drums. ‘68-72 the 10” drum spindles used the same small upper ball joints as the 9” drum spindles. But in ‘73 the 10” drum spindles started using the same large upper ball joints as the 73+ disk brakes.

So, it depends on which spindles that kit is designed to use. What’s the part number of the kit?