[Need radiator cap for 29 Desoto]

Where might I be able to find a radiator cap for my 29 Desoto? Doesn't need to be original, just functional.

 

Thanks!

[1938 DB Air filter]

Perfect, thanks!

[1938 DB Air filter]

This is what I have. I'm just trying to determine what I need to find/add to make it functional.

[1938 DB Air filter]

I inherited a 1938 Dodge Brothers when my dad passed away earlier in the year. It's been in storage and I'd like to bring it home, but when I went to get it I noticed that he had the air cleaner off for some reason. I found the air cleaner in his garage, but the filter wasn't in it.

Could someone share a picture of what the filter itself looks like so I might be able to locate it in the mountain of car parts he amassed over the years?

In the event I can't find it, is it possible to order one from somewhere?

Thanks!