The Kelsey-Hayes Disk Brake Swap Thread

64conv65hard said
"This Kelsey Hayes disk brake swap should work for any A-body with the 5x4 small bolt pattern wheel, EXCEPT those with 13” wheels". Why does this swap not work for cars with 13" rims? Are they built differently?
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Rotors and calipers are too big and would hit the inside or top of the wheel.