Do you have any suggestions on an Auto store and size of fuse to use at the BatteryI had a 955 for a short period of time. I believe the fuse was a 15 amp. I did replace the factory fuse holder because it was getting warm when used on FM. I forget how much voltage drop I had across the fuse holder but it was not acceptable.
You can probably go to an auto part store and get some heavy duty wire and fuse holder cheaper than the premade harness. You'll just have to solder the connector on.
Overkill on the wiring is good just use the proper fuse where it connects to the battery. If the fuse is at the radio the wiring between the fuse and battery can still short out and start a fire.