Shimano UN300 is a good as anything.
Be careful not to cross thread it going in, watch a park tools video.
Lithium grease the threads, and coat the BB shell with regular grease.
They were costly then, and remain so, but my Phil Wood square-taper bottom bracket feels like new after 46 years, without any maintenance whatsoever (they are sealed, lifetime bearings).
does it say that on the label or have you just measured it? 118 & 122 are more common?
if it does actually say 120 on it either will work its only 1mm out either side to a 122. or you could get a 120mm from spa - ccoule of cheap options but not a UN300
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