CB750 CR Fan - I picked up a 4 fuse modern block like you described. It is a bit larger than the original, but I may be able to make it work. Thanks for the suggestion!
Cityscapedview -
It is an amazing collection. The video only shows part of it...
RAF122s - thanks for the advice! I did go ahead and order a replacement slide for my #4.
It's nice to know with the blade fuse block that you can get a spare fuse almost anywhere, whereas tube fuses are definitely more scarce.