Screw and bolt for IKEA Aröd lamp (Off Dalston Lane E8)

Bit of a long shot. A screw has broken on our IKEA Aröd floor lamp. IKEA can’t replace it (as it is not a spare part) and I can’t buy a new one as it is not a standard screw and bolt. Has anyone got a spare or similar that might work that we can have please? Seems a shame to get rid of the whole lamp because of this.
It is about 3cm wide and 3cm long.

       
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