The HiSpec caliper with E-brake is a cross bolt mount, not radial mount. There will be some sort of adapter needed to make this work.
HiSpec does offer 130mm radial mount(like the front Elise) caliper options, 2 pot and 4 pot. The 2 pot looks very close to the AP that is stock on the Elise.
HiSpec offers pads from a hand full or makers so there are some backing plates made, not sure what the options are in the US. Not many track oriented pads offered so keep that in mind.
2006 Elise with BOE 400 supercharger and some aero mods, CRF floating oversized rotors, MCS single adjust coil overs, CRF exhaust, CRF sway bar w/adjustable link, mono-ball pivots, machined steer arms, baffled oil pan, CRF titanium toe link brace, hardened motor mounts, Ethos wheels w/Yoko slicks