I know you have been talking disc brakes for a long time. I just joined and i have a 1937 1-1/2 ton. i desigend my own kit. I liked it to look original but needed brakes in the mountins.My objective was to put it togeter so that i can revert back to origianl. I attached some photos of the conversion. Its not very hard to design and install. I'm not familiar with different years or models what would work or not.
