After spending a lot of time under the car with the Corvette (and Honda) e-brake cables, I don't like what they offer. The GTM needs an asymmetric cable system. Controlcables.com looks promising, but I think the WILWOOD kit would give more on-site flexibility.
My only concern is tying into the caliper, on the Corvette the cable hooks onto a lever on the caliper, hopefully this kit can reproduce that. There's also a tension spring at the caliper, but I should be able to delete that, may have to add a spring elsewhere in the system.