Type 4 Fan shroud - what goes here

on the end of the fan shroud there are four tapped holes, not quite sure what size? would I be right to assume there should be a bolt to secure the bracket that goes to the oil cooler (anyone know what size thread?). as for the hose connection what's that for?

 

That's for inflating your air bed.

 

I don't know for sure but can I guess at aircon compressor fitted those holes?

 

don't know, is this not standard then? ... I'll just make sure the oil cooler bracket is secured to the top left one in the picture