Floor braces

[Boots43]

Hello Gents, I am new to this forum and new to '58 Buicks.I have a Special sedan that I am replacing most of the floor,inner and outer rocker panels. My challenge is that my floor braces where the inner rocker panel gets welded to are in bad shape,the rest of it running under the floor to the other side are in good shape. Have any of you found a source for these or had them fabricated? I thought about using 1957 chevy floor braces and modifying them.What do you guys think? Any help or suggestions would be great. Charlie