I saw the same thing, went through the process to get an account with Tifco, placed an order which came yesterday. They were the flat ones, I called the salesman and he didn’t have an explanation.This looks like what you’re looking for.
https://www.tifco.com/products/42876Gary
I bought a bunch from Stein air.
https://www.bluesea.com/products/category/15/76/Fuses/easyID_Fuses
Use the "where to buy" option to find a distributor/retailer.
Disclosure: I am an engineer with Blue Sea, I have nothing to do with sales and receive nothing other than my normal paycheck every two weeks.
I'm just trying to provide another option.
Cheers!
I used to always use these fuses with lights in them that illuminate when the fuse blows. Unfortunately when the light is activated the light circuit causes an ohm meter to show continuity when trouble shooting. In other words the multimeter shows good continuity rather than open circuit. So working from component back to under the panel can be a frustrating process unless the fuse panel is easy to access and easy to view. So while a novel idea I swore off of them.