I have a stand alone shower on a slab foundation that leaked I pulled the floor out and the cast iron flange for the liner is in bad shape and needs to be replaced. How do I go about this and where do I get the parts.

To replace a cast iron shower drain and flange you will have to have lead, okum, a lead ladle, torch and cauking tools. All this plus the necessary plumbing skills to, yarn, lead and caulk a lead joint.
You can pick up a new one at any plumbing wholesale house. If you will give me some more details perhaps I can come up with a better solution. Cast iron drainage? Have you unscrewed the strainer? Is this flange flat with hex bolts holding it down? Get back to me and I'll answer ASAP. Cheers, Tom

Thanks speedball1 for the reply... yes I do have the tile floor pulled up and I have it all cleaned up right down to the slab. I was able to remove the screwed- on portion of the flange, but the threads are all rusted away. It apears to be only leaded to the drain pipe not a two bolt flange or anything like that. I did look at the home depot, but they do not carry cast iron parts the guy there suggested a PVC conversion flange but I would need to do some demo to instal it. It seems to me the leaded in cast iron flange would be the best way to go. I feel confident that if I can find the part and with a few tips that I can get the job done.

Try to pry the leaded in portion of the flange out. If you can't do that then take a cold chisel and break it out but be careful not to crack the raiser from the trap. Save the lead. Now go to a plumbing supply house and purchase a new cast iron shower flange and enough okum to yarn in a 2" joint. If they won't sell you that small amount then try a large plumbing shop. Also, you might wish to check around to see if you can borrow or rent a lead ladle, a yarning iron, a packing iron and a set of inside and outside caulking irons. Get your material together and your ducks in a row and I'll walk you through yarning, pouring and caulking a lead joint. Making a lead joint in cast iron is almost a lost art since the advent of plastic and PVC but you have a plumber that broke in on lead joints and I've got a great memory. Let me know when you're ready to began. Cheers, Tom