Own a '14 Mercedes ML350 as well as a '13 Durango R/T. Fuses for the ML have a small "s" next to the amps, hence 20s, 30s, etc. Been all over Google, Rock Auto, major parts stores' sites and cannot find any to buy. Supposedly the "s" means "slow-acting". Some said it meant "silver" as the blades were silver coated to prevent corrosion. So I am widening the search field to see if any of my Dodge brethren can point me towards them. You can see on the fuse diagram photo that they all have the little "s". Thanks!
So far no go at O'Reilly's and Radio Shack. None of the prepackaged Littlefuse blades had the little "s". I went to RS for something else and saw they had drawers of fuses, some saying "Slow acting". But they were mostly old-style glass, not blades. Will be swinging by the MB dealer later this week to see what I can learn.