I used the setup out of a Mustang II. Not that those are so easy to find these days but I works. I also happen to be using an MII console but very many of these cars didn't have consoles, the just used a simple cover over the assembly.
I cold chiseled a big chunk of the trans tunnel out to get mine. With a sharp chisel it's easier than it sounds. Turned out to be overkill, I didn't need it. The assembly just bolts in. It was nice to have an exact template for cutting the opening though. I also cut off the "cable guides" that are tack weld to the underside of the rear passenger floor pans. You need these to guide the cables up into the transmission tunnel without rubbing the driveshaft. Once I had them in the shop I just ground off the excess sheetmetal they were spotwelded to. It might have been easier to just directly chisel them off the start with but I didn't want to distort and damage them.
My 67's cables I ust cut off at the very front. I took them apart, cleaned, lubed and reassembled them. They are a LOT longer than what the MII cars used so I had plenty to work with. The MII bracket at the handle is a mere "hook" you just loop the cable over. After much fiddling I looped the right cable and clamped it to the left cable about halfway between the handbrake and the guide. I used cable clamps meant for repairing the cables of a garage door. After much adjusting and making sure I couldn't yank the brake hard enough to pull my clamp off I trimmed the cables. And it works great.
I imagine a Fox body Mustang brake install would be similar but finding a car without the factory console is very tough. The really stripped down base model cars seem to be rare, whereas the junkyard MII's I've seen are split about 50/50.
