@jimmclarty
In my limited experience, I can relate to your situation.
First: OEM brake shoes have a "wide" slot and a "narrow" slot. Aftermarket brake shoes that meet OEM standards also have wide and narrow slots.
OEM brake cylinders have wide and narrow slots on their ends. Aftermarket brake cylinders THAT MEET OEM STANDARDS also have wide and narrow slots.
This wide and narrow design is an indexing feature, in order to force the installer to place the shoes in the right orientation, since the wear material is offset to one end for braking performance.
Now, in my limited experience, major aftermarket FJ40 parts suppliers have supplied brake cylinders in which both slots are narrow. One of them, when I called them on it, told me to "grind down the [wide] slot to make the shoe fit." to which I replied, are you really telling me to defeat a Toyota safety feature to let your non-conforming parts work? A refund was in order.
So, for your situation, either find acceptable replacements, or, if time is of the essence, I would see if the wide-slotted screw from your old brake cylinders would fit in your new cylinders.
Good luck!