Pretty fair price for what you get -
fuse holder, 2 fuses, wire pigtail, custom mounting bracket with screws.
Some guy is doing the old Model A people a kind favor. That's easily a $20 part on the normal market at today's markup rates. Of course you could make your own from parts in your scrap drawer, but it wouldn't be as neat.
I have a drawer full of fuse holders of various kinds. I've been using them on my 3B. I'm fusing separately the horn, lights, wipers and ignition. I'm using the fuseholders to fill some of the many, many holes in the dash drilled by POs. Definitely not original, but functional.