Broken exhaust flanges

[Panthor]

I bought a used set of s/s downpipes for my fzs600 and now noticied that the flanges have had welds put in previously and now have further cracks in them from being overtightened, unfortunately one has already snapped off.
Anyone know of any solution? can it be welded?
I've tried finding flanges in 2 parts that can be joined but no luck for the size and can't find a company to make any yet.