On YouTube.com, search for Zimaleta and see if you can track him down for used fenders. In the YouTube video, he took the fenders off.
Interestingly, some of the fenders sold new are apparently separate from the headlight enclosure piece. But the two pieces looked glued together on the Sprinter and in the YouTube video. EBay and some new ones include and don't include the headlight enclosure piece.
The price of new ones is around $140 or so (perhaps aftermarket), while eBay has a wide range of prices.
After watching the YouTube video, you could also check salvage yards and dismantle one. Can also check the subforum for folks taking apart Sprinters for salvage. As the fenders are big, may want to buy locally.
Confirm got 'em in both white and a passenger side outer fender with fancy schmancy blue & white transport artwork.
Also have the same on the hoof, all can be humanely removed by sawzall as a complete cut again in white.