The original fuse blocks were only of average quality. I had to move a few wires into unused positions temporarily.
New ones can be purchased at most auto parts stores (Napa, Pep Boys, Auto Zone, Kragen) or at a boat store (West Marine, Boats USA, etc.).
I found some nice ones at West Marine. The various packaging extoll the virtues of each brand, mostly relating to the contacts.
You'll find that a good quality block will also reduce fuses blowing.
2003 Alpine 40FDTS (400HP)
Long Beach, CA