I actually have a customer in Brazil that has done the ERL S2k pump on a Z3 block and pan. He did the same thing I did. It's actually pretty easy.
You can see where I ground the lip off the pump here:
Once that lip is out the bolt circled hits the pan here (where I ground away):
The grinding goes through the pan just barely, so it has to be welded to seal a small hole.
The *other* option is to use an M6x1.00 bolt that is like this and see if it fits:
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