I wish I knew man- you could try Warehouse Services if you have one in the states(they supply Napa), junkyard fuse block if you can remove them, or maybe a gm dealership? I put in a hotwire kit for my fuel pump so i had an external relay, and i used inline glass fuses for my e-fans and water meth pump-could have put them in the uhfb but it was more convinient.