Hi,
My G60 pump is the same 4 bar VDO unit, , it was bought from a e-bay trader more than 10 yrs ago who sold dealers old stock etc, it was a Genuine VDO Unit, I didn't fit it for 10 years (!), and it had acquired a couple of tiny cracks, they had not been there when I looked at it a few years ago, so must be an plastic aging issue ( probably the same rubbish plastic used for the headlamp adjusting screws holder), no cracks around the fuel pipe junctions though, I will be taking it out again to redo the fuel hoses in tank, so will check again, may have to think about replacing it again!
Attached a couple of pics.