Drain plug size on rear diff w204

[Diamondw204]

Hi guys,
am after a magnetic drain plug on the rear diff for a w204 c220 CDC sport 2007
Can any one advise the size or where to locate a good one, have looked at dimple which seem to be good but I don't know the size.
Am busy cleaning sorting and getting the car up to the condition I want
I must love it as I've never cleaned air vents with cotton buds before lol
Ordered a 3'ton jack as my 2 ton cheaply seemed to struggle,have dimple sump plug on route.
So the jobs list is getting smaller
Thanks in advance

 

[bob6600]

EPC shows this one but doesn't give dimensions although the ebay ad does

NEW Genuine Mercedes Benz Oil Drain Core Plug M24 x 1.5 x 12 mm A3529970032