Brake cross shaft hangers and riveting rivets

[Zetomagneto]

I used 8mm setscrews on the Rosengart ( well it’s a metric car ain’t it). Plenty strong enough

Derek, good for Rosengart, plenty strong enough but way oversize for a brake cross shaft bracket.
8 mm will have a 13mm head will will be tight fit in the channel.

1/4 or 6 mm should be ample, I would prefer 1/4" cause it's imperial innit