Anyone know where to get monel bolts? Otherwise I will just have to use duralac in key locations.

I'm intending to replace the beam entirely rather than repair with a sleeve. I may reinforce with a sleeve at some stage, if it's legal, although crevice corrosion would be an issue where water puddles inside the beam.

I have checked the onesteel and smorgon catalogues in search of a 3.5 - 4mm wall thickness with no success.