For AZZ to qualify for the US tax relief (Section 1031 of the US Internal Revenue Code), AZZ have to spend their US$200m within 180 days of their contract date (29 Nov) or settlement date (15 Dec) - I'm not sure which.
Either way the deadline runs out end May to mid June. Haven't read anything that would exclude our assets, so imo it's possible our US assets (not AMU shares) form part of AZZ's plans.