I have about 4'-6" of silver and red and I have plenty of 4 gauge agu fuse holders. The red wire is a soild red jacket and the silver is a transparent jacket if that matters.
When you say barrel type fuse holder, are you refering to the type that is in the far right of the picture below? If you are, I got you covered and I also have some 8ga red and silver wire. The wire is Streetwire, the fuse holder would be either the Streetwires on top or the Tiff on the bottom of the photo and all the items would be new.
If those items will work, let me know. You know I just about give stuff away.