Sorry.
I need to proofread better. I meant to say if you need the full set you’re probably best building them.
I’ve got the 36” version of the same machine. I bought it missing a COUPLE of fingers and found those on eBay. They weren’t cheap and I’ve often considered making more instead of buying them in the future.
I’d use 4140 PH or similar.
I’ve got 6 6” dies, some combination of which spent the most time in the brake. I think I’ve got 2 4 1/2” and 2 3” and maybe the 1 1/4”(?). The 3/4” seems pretty worthless.
Point of saying is, in my opinion, if you’re gonna make your own dies, bias to the long side. I would make more than just what will fit the 24” opening at one time. Once the rough shape is there, in pieces long enough to cut OUT OF, you can always make filler teeth as you need them. I would love to have one 36” or 2 18” dies and another 2 or 3 linear feet ready to go.
Obviously that all depends on ability and equipment, but I would recommend buying 10 or so feet of material and cut, grind, mill the longest pieces you can accurately enough.
Sorry for the confusion
Be safe and stay healthy
Jeremy