These have been known to work and come with the flanges, just cut as short as needed tack weld for fit and weld out when your happy:
https://www.speedwaymotors.com/Tight...teel,1722.html
I don't know if these pre made units will fit the cross-member -
https://pypesexhaust.com/i-12200745-...rn-dcc10s.html