This TITAN adaption kit is intended for GM trucks with LB7 engines produced in 2001–2003 and certain 2004 models; it is required when fitting specified TITAN tanks. The kit includes two heavy-gauge metal flanges and one O-ring and is described as a custom application part produced by TITAN. Freight notes in the source are omitted here; the overview focuses on fitment and included hardware.
Titan Fuel Tanks 01-04 GM 2500/3500 LB7 Adaption Kit