There you go. Why not just weld/or have a loop welded on your flange. Then go to an exhaust or motorcycle accesory/spare shop, and pick up a spring... no biggie...
Also, get the proper exhaust gasket (ring), sometimes after removing the flange, it just wont seat that well again and start leaking spooge all over the place "YUK". As the gaskets get old, the carbon keeps it sealed off well, when that get a disturbed, you might get a leak. The last thing you want is ANY leak in the exhaust system!!!!!