Hello, there is a gap of approx 20mm between the replacement intermediate flexible pipe back flange and the rear exhaust flange. Would it be possible to pack this with maybe 2, 10mm flanges stuck together or maybe cut the ridged pipe part of the flexi which bolts to the down pipe and put a sleeve over and clamps.

Also what about replacement bolts and nuts for the above part, are these of a certain type. Many thanks.