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These are some sort of OE block as they have the bump stop arm sticking out of one side. They are flat top and bottom, no taper, but do have a thin shim that appears to be held on by the center pin. I'll take some pics in the morning and post them.
For what it's worth, those blocks are out of a Ford. I have them installed on the back of my dually. They are slightly wider than the Chevy springs, so installing the u bolts is a pain, but its doable