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.
dskinner5
Post removed 
The only fuses I've used in recent years that blew were SR Black fuses I was testing for their sound. Also, I concluded that they had no impact on the sound of the components I stuck 'em in, and after testing I sent the pile of them back to my source. I'm sticking to Littelfuse and other stock fuses that work fine and, like any other well sorted fuse, have zero impact on the sound except when they melt.
Post removed 
I’ve been in the fancy fuse game ever since Isoclean, yes they’re UL rated, came on the scene nearly 20 years ago. So, I was one of the first. But I never had a fuse blow. I’ve also had Audio Magic Nano fuse. Never blew. Boy, was I lucky!Â