19 gt pp2

Have a 19 PP2 with Steeda H-Pipe and Active Exhaust. Found a great deal on brand new unopened set of ARH 1-7/8th Headers. Problem is they are the 3” direct connection to Corsa. ARH Corsa Connect System What parts do I need to mate the 3” to 2.5” for now? Would something along the lines like...