Crankshaft Pulley Bolt missing

Okay, so pulled one of the bolts out and turns out it's far shorter than the one I thought had dropped out (Pulley bolt on right). Upon looking at the picture again it doesn't look like a bolt had been in that hole for a while and the fresh marking left behind from the bolt I pulled out the pulley confirmed there hasn't been a bolt in that hole for a while so I've just tightened them all up properly this time since a few of them were quite loose to begin with!!

I did loosen them all and turned the pulley and it did shift a little but not enough to align the thread. Still have the squeal when revving but I think I'm going to be installing an electric fan at some point in the near future.

Thank you for the replies everyone, I appreciate it.

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