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Looks more like an elevator bolt ( large head 1/2" threaded body) .that is through a larger washer then 2 shims or one 1/4" shim rubber set to frame and washer ,lockwasher nut to bottom . Other rad's had stud welded directly on support . Most rusted bad.
Your welcome .. I thought if you just wanted functional maybe fab from 1" channel or tube stock split . The dimple on end , leveler by hump where bolt goes up thur pushing down to the rims edge with that fork end , does it .
I made flare with the exhaust pipe machine . You can buy many adapters at LAS or even pipe expander tool . Although i never used a hand one . The piece you need if it is only small offset to muffler should be available from cutting out of any random exhaust pipe or from full length at shop . You will not get a one piece from manifold to muffler . You need that one joint to roll the off set in to fit nice and even get thur dust pan .