If it gives you any hope, My floorboards looked similar to yours. Those are new floorboards from midwest mil and the support bottom is a fab from what was left similar to yours.If you look close you can see the weld lines where the bottom of the support was fabbed in. I copied the drivers side for the shape. I got the channels from midwest also but the M170 has them in a slightly different fashion. Had to tac them on, put the body in place and re-adjust and trim the supports. The floorboard on the passenger side also is different and took some custom fab work to get them in. I think if they were put on a M38A1 they would have been really easy. As it was, it was very nice to have something close to use on the M170.