Catalytic converter flange

My catalytic converters are still passing the emissions test, but I'm thinking about how I could repair the rusted flanges and studs. Sooner or later they're going to have to come off or will fall off of their own accord! I found these replacement flanges https://exhaustpartsuk.com/product/3...-2-1592954917/. Does anybody haver any experience with or thoughts about this job?

Same question for the silencer/back box flanges.

Thanks

Peter

Attachment 14747

when i made my exhaust, i measured the flanges , drew them up and sent them to whengparts.co.uk to be laser cut... as for studs etc, i use nut and bolt, stainless bolts, brass nuts :)