BFM

Hi all, Happy New Year! Does anyone know where I can find a catalytic converter for a 2002 C6500 V8 8.1L Gas Engine?? Thieves cut mine right off and I've been having such a hard time trying to replace it. I've tried both Walker and Magnaflow and they said the don't make anything to fit that size vehicle. I searched Google using these part #'s (15070544, 15032922, 15769709) and came up empty. Does anyone on here know where I can find a replacement part or have any suggestions on how to replace this damn thing. Any help will be greatly appreciated!