How does that bracket unbolt? Are the fixings going into captive nuts on the chassis or do you somehow have to get a spanner on the other side?
There is a plate fitted from inside that has two studs welded to it, so yes captive but studs not nuts. I looked into moving mine when I needed to fit Aero side pipes with shorter silencers. Difficult to access though given trim, seat belt anchor etc.
Note to OP. There is plenty of adjustment with factory setup both vertically and laterally so no need for any tention when re-assembling with new bracket MXC0220, when you can get hold of one. Would suggest, as others have, taking the opportunity to fit stainless bobbins though, also available via SiFab.