Sounds like your ’34 is coming right along! Sidemount covers can be pretty hard to find. Over the years, they kind of "got in the way" and past owners took them off or set them aside, so they do turn up on Ebay, Hemmings, or swap meets, occaisionally.
I have not seen them, but CCCA does offer reproduction sidemount covers in multiple sizes. There is an updated listing in the PAS Parts and Services Directory.
For more info, contact:
Indiana Region CCCA
Good Luck in your Pierce projects,