A very slim possibility exists of my obtaining a Lithgowicon Mk 1 III from WWI that is missing it's bolt.

What difficulties can I expect on replacing the bolt. I have seen bolts for sale for $50 online but will any bolt fit or do I need one LIthgow specific?

I imagine there will be some headspace issues possible but seem to recall there are different sized bolt heads to address this. Is this correct?

Rifle is supposed to be in pretty rough shape but restorable. I have not seen it yet and will not for a few days so I don't know if it is missing anything else.
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