I-Beam 700 HX Fuse?

We have a couple of these fixtures in our building here and we were looking to resurrect them, but we need a fuse for them.

There weren't any in the fixtures but I was given two that may work. This is what was marked on the fuses...

Buss GMA 4

-and-

6.3A 250V

If it isn't either of these, would anyone know what the spec is for me to get new ones somewhere?
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