Get a shop to weld it together?

When my kids 2002 S60 2.4t muffler rusted at the hanger I replaced with a kit like this. Came with hardware to bolt to the catalytic converter. If you have that much rust the muffler at the back may not have much life left. I’d assume you could source similar in your country. https://ebay.us/m/gNbN6z

Need some ideas to connect this. Can’t replace connection bolts since holes are rusted out. 2007 Volvo Xc70 . Depending on your situation. Search "Exhaust Flange Repair". . https://www.youtube.com/shorts/WgSFPHzpW7M https://www.youtube.com/watch?v=j6gayKodiyA https://www.youtube.com/watch...

I drilled out the rusted and broken studs on the exhaust flange and replaced them with stainless steel bolts, washers, and nuts from a hardware store. Tried to find a picture without any luck. Getting the drill bit to bite and stay centered is tricky. My angle grinder does a good job getting a flat ...

this s the style that held up for me, use dble steel gasket and high temp red rtv. Measure the exh pipe diamter to get the right size. Clean the mating flanges with a belt sander, apply rtv/gaskets and raise the pipes with a trolley jack on a milk crate, then cinch the bolts. https://www.amazon.com/...

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If for some reason you aren't able to use the existing holes you can try this.
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this s the style that held up for me, use dble steel gasket and high temp red rtv. Measure the exh pipe diamter to get the right size. Clean the mating flanges with a belt sander, apply rtv/gaskets and raise the pipes with a trolley jack on a milk crate, then cinch the bolts. https://www.amazon.com...

I bought one of those butt-clamps but my soup can with two clamps has help up for 3 years.