Most amp manufacturers don't believe in after market fuse, and in lesser extend -power cords. I have had several well known brands (ARC, Krell, CJ to name a few) and they all HAVE to say that it does not matter from a corporate point of view.Actually Kal at ARC concedes after market fuses are superior quality but timing is different so MIGHT not fully protect the component when it blows.
From my experience only ARC doesn't recommend after market fuses.