Type 4 snail fan

Planning on reinstating the snail fan in my van. Can't see where the fan fixes to the roof of the engine compartment.
Does anyone have any pics showing the mounting points?

 

Many thanks. It looks like it just bolts in - is that correct?

 

I thought originally there would have been 2 studs on the engine bay roof ?

 

I’m not sure it is my first dealings with the type 4 engine setup,
Flakey may well be right .

 

I've got these in the engine bay where the fan goes. Any idea what they are and how do they come out?

 

I'm not convinced my van was always a type 4 engine as there are no obvious bolt holes for the snail fan.

 

I was wrong, M6 bolts into captive nuts in the frame of the inspection hatch.