320/520/521 Aluminum Disc Brake Upgrade Kit $450
Kit allows later model hubs/rotors/calipers to mount onto the stock kingpin suspension with a simple modification to the spindle. This kit uses '87 D21 rotors, not 720 rotors as the previous kit did. Hubs from multiple years of Nissan trucks can be used, but some may require modification to clear the center holes of your rims.
This is the aluminum version of the previous steel kit, and does NOT require the wheel spacer to fit stock 14" steel rims.