Best advice I can give you is ..grab a sheet of steel from your local jobber and a couple Pieces of angle iron for a brake and make what you need..none of that is available off the shelf anymore..you will need to fabricate them ..lots of good advice and pictures on here or other sites of many guys who can show you what you need to know ..or you may have to farm the work to somebody who will do them for money ..but you will need to do a little leg work and look around for pics and ideas if you are not a sheet metal basher..none of these are hard to make ..floors are easy ,rockers are easy, rear wheel houses are easy..so three easy pieces..get to it ..never learn till you make a few mistakes..
Chuks right. You'll be hard pressed to find those parts. There is lots of info and guidance here. Start pounding or paying. but way more fun to learn/do it yourself.
You can try www.IandIReproduction.com they do 1929-1954 Chevrolet they are in California. I also do have a 37 4 dr chev forsale if you are interested or if you need to make some patterns.
I was figuring I was going to have to pound some metal , I was just hoping to find a time saver
but I guess I should be searching fabing tools rather then replacement parts