Why do you need exact? You can go with a higher voltage rating. A 250 10A slow blow fuse will work just as well and offer the same protection. You don't want a lower voltage fuse though since the glass might explode when the fuse blows.
Do you know where to buy such a fuse? All I know is the required fuse is listed as Slow Blow Fuse 120V 10A for AC input power. I don't know fuses and thought it had to be as listed.