Hope I'm not too late to the party and you haven't already headed to town to try and find this hardware. Here's what I found searching through a 1929-46 Chevy Master Parts Book (numbers correspond to my annotated original picture of yours):
1 - Top of door panels screws - GM# 3681736 Screw No.8 - 15 x 1/2" Type A Clutch Head (I could find no sources for original style clutch head screws. You can find a similar No.8 - 15 x 1/2" Sheet metal screw at most any hardware store like the one in the 2nd picture below that should work, but you would have to add some "patina" to it to kinda hide the newer style screw but still let it do it's job.)
2 - Door and window handle - GM# 3654595 Screw No.10-32 x 3/4 inches Fillister head screw, chrome (You can find these at several of our vendors like
Chev's of the 40's # 3654595 36-46. Sample shown in 3rd pic.)
3 - I couldn't find a listing for the screw with large flat washer that threads into the lock at the rear edge of the door, but I also noticed in one of your earlier pictures above that your door had the Clutch head screw and washer. If lost, maybe 46Sparky can tell you what he used as his picture above shows a later cross tip head machine screw and washer working in that spot.
