Merc Mag 496 HO Manifolds

[James TT]

Hi
The aluminium manifolds on my 496 Mag HO 2005 are badly corroded and are now leaking exhaust gasses.
Has anyone taken a set off (that are in good condition) to upgrade to aftermarket that may be willing to sell or trade?
I would prefer the later cast iron type which I believe were standard from 06 onwards?
Thanks