1x18 doesn’t seem to be very common. I’ve found 1 assorted grit package.I thought these were a nonstandard size to discourage substitutions?
They do have them, in 10 packs for each grit. I guess I’m being picky!I would check red label abrasives as they have sizes for the worksharp without the grinder attachment at least. I don't see the 1x18" size on their website but I do see them on Amazon so they're out there. Maybe drop them a message and see what they have or can do.