Just an update on aftermarket status if anyone is interested:
Autozone and Advance do not specify separate part numbers between SVT and non SVT rear calipers. And the ones the system says fit the SVT do not because that lower braket is incorrect.
NAPA DOES specify a separate part number for the SVT calipers and they DO have the correct brackets. I just picked up a pair this morning and they are both re-manufactured Lucas calipers (who supplied the OEM Ford ones) and the lower brackets are both stamped with the 'FORD' tool mark.
April 2010 ROTM
2011 Yellow Blaze Metallic SES Fiesta hatch
Carlisle All-Ford Nationals 2011 1st Place - Fiesta Class