Which SR Blue or black Fuse

Which SR Blue fuse for ARC REF 5SE? It says 5A slo/blo 250V on the fuse but no size MM?any help? Anyone had any experience with either fuse and what was the result.
Fuses, fuse holders and the additional wiring ( or circuit board traces ), impair the sq, but, for the protection of the piece of equipment, it is there. One comment I always appreciated was by Bill Lowe of AQ.    " To Due Less Harm ". Better fuses ! Enjoy! MrD.
Remove all the screws from your gear, and replace them with titanium versions. Your gear will sound that same, but it will be slightly lighter, possibly resulting in the .0000023% sonic improvement attributed to fuse direction. I did say "possibly" but sonic enhancement from a fuse is mythological at best, and expensive at worst.
But what if you already have a screw loose?
Too have a screw loose one is making a dangerous assumption that there were any screws present to begin with......
Geoffy said:

Why is it we oft see the ones who complain about name calling the most are the first to call names when the opportunity arises?

Really Geoffy? Rpt Really Geoffy? How ironic you read your message of indignation on that subject. Disingenuous much? - don’t bother answering, the question is rehetorical.