I would replace all belts at same time ,MB belts are very easy to change once you understand how they loosen and tighten manual is great help here unless your I.Q.is 180 +. frist thing I do when adding to my fleet is all new belts and hoses can be had for a c note ftom FastLane and then rest easy a crate engine for my Euro 500 SE is 23K! do them belts and hoses.........
William Rogers.......