C10 Floor supports?

[ponchogmguy]

Hello I am new to the forum but was wondering if someone here can help me. I am looking at a particular 71 c10 and I noticed what appears to be cab floor support rust on the drivers side floor, which connects to the cab mounts. Actually the rust is so severe that the support is almost gone in some portions. My questions are can this be repaired and would this require new floors or just the floor supports? Any idea of cost? If someone can help it would be greatly appreciated.