They replace the smallest new fuses on new vehicles. These fuses are smaller than low profile Jcase fuses. They are also very difficult to find. The difference between this and your factory fuse is the height. I don't care that he's taller than the old man. I'm not that picky about little things I've never seen before. It also arrived three days after I ordered it. I could not find this type of fuse anywhere in my city. I went to my local Dodge dealership and not only didn't they have it, they didn't even know. BTW, I have a 2013 Ram 1500 car. I'm ordering a few more to have in stock. I hope this review helps you.