I just bought front floor for my '37 slant back, including tunnel, from Drake. It is for "39 - '40 but after I researched the hell out of it will work just fine. The clincher was of a video of a guy using the same one on a '36. An available seat riser also looks the same and a panel from the riser to the rear body panel will work except for the tool storage piece. The over the axle section is correct, but the trunk has a different pattern/shape. To do the whole thing plan on letting go of some serious cash ($1,500 to $2,000). Look for someone in your local or a free freight deal to save money. I drove 250 miles to cut costs.
Yesterday I was pressure washing the crude off it and found the drip rails were rotting off. That is One item that is no longer reproduced, oops. May have to cut them off a downer car. Same vintage Chev is a possibility, but scary.