An OEM (Original Equipment Manufacturer) would probably use 1020 HRS for the plates for low cost, durability and ease of welding.
A couple of things to note are it looks like the OEM uses wider plates than the coulters (I'll guess 1/2 or 3/4 inch thick plates vrs 3/16 or 1/4 inch thick for the coulters) and the OEM put notches in the plates that wrap about half way around the cage rods. With the notches, the cage rods can be welded to the perimeter of the plates with two welds across the width of the plates and those welds can all be made from outside of the cage.
I'm not sure what material an OEM would use for the cage rods, probably 5/8 or 3/4 inch diameter 1020 HRS or maybe 1018 CRS for a little more strength and wear resistance. I think re-bar would be too soft and would easily bend.
Maybe someone with this type of rollers can help out the OP by measuring one that works well and has held up well.
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