Thinking of a new 'product' for these bikes: a fully-wired, plug-in, bolt-on ATC fuseholder replacement fuseblock for the CB750K3-K8/F bikes. It might fit the 550 as well: I don't have a 550 block on hand to see if the bolt holes are the same dimensions (someone else know for sure?).
It will come with a little wiring harness to match the plug on the bike's wire harness so it drops right in. These have a little water splash cover (boating products) to help in the wet.
Poll: how many might be interested, so I can make a buy of parts? The final price would vary based on the number of parts I can buy at once.
UPDATE: ====
Now that I'm finding myself making them
:
Please, if you want one, take a look at your fuseholder and let me know if yours has the 15 amp fuse at the TOP or the BOTTOM of your existing holder. For example, the 750F in the picture (later in this post) has it on the bottom circuit (the RED wire circuit, if you can see your wires), while some bikes have it on the TOP (where the RED wires will show up on those). Thus, I can send it to you in the right configuration...I'd hate for you to get one upside-down and blow the 5 amp fuse as soon as you turned on your key...