How to get this arch

[Smokey Bear]

I'd say you could roll them or cut and weld. Depends what your tastier at doing though. Although looking at them the 1st and 3rd pic don't look rolled judging by the shape of the arch, the chaser looks rolled though I think that looks nicer but the r32 is a boxier shape so maybe that's why the arch shape is a bit different in the two pics.