Cast iron flange replacement in slab floor

[tech287]

Old 50s or 60s slab house.

One of the flange's mounting bolt tabs (terminology?) is broken, so the toilet can't be properly secured to the floor, so it rocks when getting on and off, and the wax seal won't stay sealed.

The cast iron flange itself is 5" outer diameter, and the cast iron pipe is 4".

The pipe goes straight up in in the middle of the flange and stops level with the top of the flange which is level with the top of the slab. With all the corrosion I can't tell for sure but it looks almost like clay or mortar or grout was used to fill the space between the flange ID and the pipe OD (it feels as hard as the concrete slab; guessing it's as old as the house). Is that a thing?

There's a tile floor that is at least 1/4", maybe a bit more, above the level of the flange. I have read that the flange should be *above* the floor, but I don't know how I would fix this one so it would end up that way.

I tried to take pics but they don't come out useful; can't see anything but a dark hole and a dark ring around it.

I've seen lots of "flange repair" kits and replacement flanges, but I don't know which, if any, is the right one, or what might be the safest way to DIY this repair. (I've done plenty of assorted types of repairs, but not this one, so advice from those that have would be very helpful and much appreciated).

 

[Reach4]

For pictures, the night mode on my phone does well with bad lighting. When you take a photo to post, remove the rag you have stuffed into the hole.

It may be that the broken closet bolt is in a slot in the side of the cast iron, and crud or cement is preventing that from sliding out to be replaced. Chisel and/or drill might free that up.

For repair flanges, there is more than one right way. Many have ears that you can screw into the floor outside of the cast iron. That might involve drilling ceramic tile. They also have holes that are more inside that you can use instead of the holes in the ears.
PASCO 21013, Jones Stephens C85000, Oatey 42775, and Superior 21015 are repair rings with mounting tabs outside.

Danco Hydro Seat is like a repair ring with a tail. Use wax ring under.

 

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[Master Plumber Mark]

You are going to get some "toxic masculinity" going to win this battle..

If it is 4 inch cast you can just get one of those expanding Oaty flanges that you set into the hole and
use an allen wrench to crank down on the flange to secure it.... they work pretty well but I suggest you glue it
down to the floor when finished with Alex Dap

on occasion they sit too high but its worth the try