SSBC Drop spindle and Wilwood brakes?

[vette427-sbc]

'67 Firebird with SSBC 11" disc brake kit and their 2" drop spindles. Are these considered GM disc brake spindles when ordering other brake kits? Looking to do these Wilwoods that are designed for a regular disc brake spindle:
http://www.summitracing.com/parts/wi...2271/overview/



Also, what size master for manual brakes would be recommended for these with this rear kit? http://www.summitracing.com/parts/wi...37-b/overview/