2000 ML320 Fusebox Clip!

Thanks to the ham fisted mechanics (who've completely denied it of course) i have a broken clip on my ML fusebox. As this probably compromises the waterproofing, id better get this replaced.
However, after a bit of fruitless searching, i cant seem to find a part number just for the clip so i'm thinking along the worst case scenario that this isnt separate and cant be ordered.
Before i start searching the secondhand sites does anybody know of a part number for the clips?

 

http://www.ebay.co.uk/itm/MERCEDES-...arts_Vehicles_CarParts_SM&hash=item4d079c316a

Speak to this chap.

jib