try measuring the space in which the fuse holder should fit. Most of the time the fuse holders for electric pianos and organs are nothing special, they're the same type you'd find on the back of an amp or any other piece of electronic equipment.
If you're good with a soldering iron it shouldn't matter... fuse holders are usually just fuse holders.
If you're good with a soldering iron it shouldn't matter... fuse holders are usually just fuse holders.