1952-59 Ford Is this an engine side Mercury clutch bracket?

I have 3 clutch brackets, the one without the ball is ‘55-‘56 Ford with a Y-Block, the 2 with the balls have the same bolt pattern spacing and I’m wondering if they are for a Mercury of the same year?
I know for a fact that Mercury used a ball on the engine side and the frame side but I can’t find a picture or anything online to compare these to.