How would you make this?

[MWF FEED]

A m8 wants me to make new rollers for these rockers but he also has missing or cracked roller retainers.
These are from, I think, a 1920's 6 cyl French car.
Has anyone in here got a good way of knocking these up?
I was thinking maybe making a ms punch and die and pressing them, i can see them splitting tho.
shed
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