Technical Mechanical Brake Parts

I have a 1 inch cross shaft that is fitted with cast/forged levers that are 3 inches centre to centre with 5/16 clevis pin hole, 5/16 UNF clamp bolt and 1/8 keyway. I need a couple more but can't identify what they came off.
Picture of ***embly and lever for reference

 

I don't have a clue, but you might try over at the Ford Barn the guys over there are more familiar with mechanical brakes. HRP

 

Tried Ford stuff but the shafts are smaller diameter than mine.