I knew from the start that I wanted electric parking brakes so I went down the rabbit hole researching what people are using. Turns out Tesla used a really nice Brembo caliper for a while. It's aluminum, so pretty light, but what really sets it apart from the rest is that it's a 2 piece caliper. That means you can un- bolt the two halves and make a spacer to run any width rotor you want. That all sounded great, so I hit the buy it now on eBay and got one. As soon as I got it in my hands I knew it wasn't going to work for my application. The part that bridges the rotor was to thick to fit between the rotors and the wheel. I ended up using 2020 f150 calipers. Probably for the best in the long run since they are much more readily available.
It took forever to find a rotor that would work. The flange where the unit bearing bolts on is 7" diameter, so it had to be able to swallow that. Also it had to be at least 13.5" diameter so the calipers would fit without hitting the axle housing. I ended up with 08 Dodge Durango rotors. They were drum in hat, so they had room to swallow the axle flange and are just shy of 14" diameter. I did have to grind the calipers a little to clear my wheels.
I'm bought a Pantera Electronics controller for the park brake function but haven't got a chance to install that yet.
