Power Gear doesn't make fuses, so just look up the type and amp rating and buy it elsewhere. Ebay is a good source, even for oddball types. So is Radio Shack.
Is it a glass cartridge fuse, mini-fuse, or ??? You can use 2A to replace a 1.6 - no practical difference if there is a short or major overload.
Here is a 1.6A glass fuse at Radio Shack. Yours?