brake drum bolts?

I finally got around to remounting my rear brake drums on the hubs, but ran into a problem with the bolts. Does anyone know what the old bolts are called that have the two little tabs on them to keep them from spinning in the holes? (some kind of obsolete carriage bolt or is there some other name for them?) Or better yet, does anyone know where I can find a few? The bolts had been replaced on one side with shorter bolts that didn't have enough length to use lock washers. Instead, they just hammered the ends over so it wouldn't come off if it loosened. Removing the nuts over the oversized end damaged the nuts. It didn't look too bad, but when I tried to install these it stripped the threads on the bolt so it is now bad also. If I had used a new nut it probably would have been okay, but it's too late for that now. Anyhow the size is 5/8" fine thread by 1 3/4" long. This is for a 1936 C-40.
Thanks!

I found similar bolts used for wheel studs in Meritor catalog, but they were 3/4", they had nothing like it listed under drum bolts. They called them "wedge head" bolts. Nothing in 5/8"

Thanks, that's more than I found and gives me something more to look for. The meritor wedge head bolts do look similar.

Well, I never did find any bolts similar to the originals, so I went with some readily available flange bolts. This does not look like the originals, but I think they look okay. I'm not planning on entering it in any of the "concourse" competitions. I'm not too concerned that it isn't 100% stock

Looking good!- Stickman 207

Thanks! I just wish the rest of the truck looked this good. Give me about 20 years and I might get there.

As long as the bolt heads don't interfere with the brake shoes I'd say it is good.

Yup, clearance is good. The original bolts were installed with the nuts on the drum side. With the bolt heads now on the drum side and the nuts outside, it has more clearance than it did before (new bolt head is thinner than old nuts). I can also recheck the nuts periodically to make sure they aren't coming loose.
It is kind of strange, though. The diagrams in the IH parts manual I have does show the nuts on the outside, but most of the pictures I've found online were like mine was (nuts inside and the bolt round head outside). There definitely would have been more clearance with the round bolt head on the inside. But if they do come loose, the damage could be greater with the bolt than it would if just the nut was loose inside, so maybe they changed things at some point?

It is more likely (I'm being nice) that someone put it together incorrectly. Under the wedge head is a raised tab that interlocks with the recessed circle cut in to the back of the drum. Those tits lock the bolt head in place so the nut can be tightened on the outside. When you try to remove them. A lot of times the bolts spins and shears off those tits. The best way I found to save the bolts was to cut the nuts off with a nut splitter and replace the nuts. You can shoot a little spot weld on them to try and fix the problem or drill and pin them or just do as you did and replace them with something else. But absolutely, for sure, they were designed to have the bolt head inside the drum and the nuts on the outside holding the hub.

Thanks for the info BlindSquirrel, but I'm not sure it applies to the bigger trucks? I have no way of knowing if these were the original drums on my C40 (or if anyone but IH made replacements for that matter), but they don't have the recessed circle on the inside of the drum. I saw an earlier post where you mentioned that and specifically looked for it. The drums just have a flat spot machined at each bolt hole so the bolt has a good surface to tighten down on. Anyhow, thanks for responding (and thanks to CB89 too). I'm always learning when I come here.