The Fairlane "shoes & drums" are the 2.5" x 10" parts from a 1963-65 Fairlane station-wagon. These are the same parts Shelby used in the '65-'66 GT-350's (with an additional upgrade to Velvetouch sintered metallic linings).
The parts are scarce and fairly expensive these days. I have done this conversion on my HiPo convertible, but, I haven't driven it hard enough to conclusively verify the additional stopping power. I am absolutely certain, however, that Shelby would not have done this modification to the GT350's unless it yeilded satisfactory results.