He reproduces the type made by Mallory for it's aftermarket ignition systems. Some call them the trash can type due to it's size and shape. This is what they look like.
https://www.jalopyjournal.com/forum/...nsers.1037842/
They are pretty large for a model A application. The Vertex Scintilla magneto condensers are another well made cap that folks sometimes use but all of these are expensive. Napa Echlin still manufactures fairly decent condensers but I don't know how much longer that will last after they were bought out by Standard Motor Parts. I always buy two or three to make sure I get at least one good one.