Finally got the special nut I needed to complete the installation of the parking brake. The nut is in the top left of the first photo with the cable going thru it. Also had to fabricate a clamp to hold the cable in place. Made clamp from scrap aluminum and attached it to existed tab with two AN3 bolts and lock nuts. The lock nuts are shown on the right side of the first photo. All that is left to do is to add fluid and bleed brakes. This will be done at a later date.